CamNtech Research Library

CamNtech products have been trusted by specialist researchers for over 25 years.

Our research library contains peer reviewed publications citing the use of our devices.

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Found 1105 Results

Cardiorespiratory fitness, occupational aerobic workload and age: workplace measurements among blue-collar workers

Background The knowledge, from laboratory studies dating back to the 1950s on the importance of the association between cardiorespiratory fitness and aerobic workload for workers health, is fundamental for promoting sustainable healthy employability among ageing blue-collar workers today. However, the association between cardiorespiratory fitness and aerobic workload has not yet been documented during daily work, […]

Related Product: Actiheart

Publication Date: November 8, 2020

From Dawn to Dusk–Mimicking Natural Daylight Exposure Improves Circadian Rhythm Entrainment in Patients with Severe Brain Injury

Background: Better integrity of circadian rhythms has been shown to relate to a richer behavioral repertoire in patients with disorders of consciousness (DOC). As light exposure has proven successful in treating circadian rhythm disorders, we sought to investigate whether simulating natural daylight in a clinical setting can entrain circadian rhythms in patients with DOC, and […]

Related Product: MotionWatch

Publication Date: November 2, 2020

Testing the Implementation of Function-focused Care in Assisted Living Settings

Objectives The purpose of this study was to evaluate the Function-Focused Care for Assisted Living Using the Evidence Integration Triangle (FFC-AL-EIT) intervention. Design FFC-AL-EIT was a randomized controlled pragmatic trial including 85 sites and 794 residents. Intervention FFC-AL-EIT was implemented by a Research Nurse Facilitator working with a facility champion and stakeholder team for 12 […]

Related Product: MotionWatch

Publication Date: October 31, 2020

Physiological Data Models to Understand the Effectiveness of Drone Operation Training in Immersive Virtual Reality

Data collection using unmanned aerial vehicles (UAVs) in construction and heavy civil projects is subject to compliance with strict operational rules and safety regulations. Both the US Federal Aviation Administration (FAA) and the European Union Aviation Safety Agency (EASA) require drone operators to keep the drone in sight and avoid flying near people or other […]

Related Product: Actiheart

Publication Date: October 29, 2020

The Psychological and Physiological Consequences of Low Energy Availability in a Male Combat Sport Athlete

Purpose: To evaluate the effects of low energy availability (EA) on health and performance indices associated with the Male Athlete Triad and Relative Energy Deficiency in Sports (RED-S) models. Methods: Over an 8 week period, a male combat sport athlete adhered to a phased body mass (BM) loss plan consisting of 7 weeks energy intake […]

Related Product: Actiheart

Publication Date: October 22, 2020

Towards a Closed-Loop Neurostimulation Platform for Augmenting Operator Vigilance

Vigilance is a primary job-performance requirement for human operators in domains that demand sustained attention, including air traffic control (ATC), surveillance, emergency response and many others. In this pilot study we introduce the prerequisites and conditions that facilitate a novel closed-loop, adaptive neurostimulation system to alleviate vigilance decrements during prolonged time-on-task efforts. Here, we investigate […]

Related Product: Actiheart

Publication Date: October 11, 2020

Objective sleep patterns and validity of self-reported sleep monitoring across different playing levels in rugby union

BACKGROUND: Growing evidence highlights that elite rugby union players experience poor sleep quality and quantity which can be detrimental for performance OBJECTIVES: This study aimed to i) compare objective sleep measures of rugby union players between age categories over a one week period, and ii) compare self-reported measures of sleep to wristwatch actigraphy as the […]

Related Product: MotionWatch

Publication Date: October 1, 2020

The influence of low-intensity resistance training combined with neuromuscular electrical stimulation on autonomic activity in healthy adults: A randomized controlled cross-over trial

Background: Low-intensity resistance training (RT) combined with neuromuscular electrical stimulation (NMES) is one method of exercise to improve the deterioration of physical function. However, it is unclear whether low-intensity RT combined with NMES (RT + NMES) can be safely implemented. Objective: This study aimed to examine the influence of low-intensity RT + NMES on autonomic […]

Related Product: Actiheart

Publication Date: September 30, 2020

Effect of vestibular stimulation using a rotatory chair in human rest/activity rhythm

The vestibular system is responsible for sensing every angular and linear head acceleration, mainly during periods of motor activity. Previous animal and human experiments have shown biological rhythm disruptions in small rodents exposed to a hypergravity environment, but also in patients with bilateral vestibular loss compared to a control population. This raised the hypothesis of […]

Related Product: MotionWatch

Publication Date: September 26, 2020

Timed physical exercise does not influence circadian rhythms and glucose tolerance in rotating night shift workers: The EuRhythDia study

Objectives: Night shift workers are at cardiometabolic risk due to circadian misalignment. We investigated whether infrequent exercise before each night shift that intentionally would not improve physical performance improves glucose tolerance and 24-h blood pressure profiles and synchronizes circadian rhythms of melatonin and cortisol in rotating night shift workers. Methods: A total of 24 rotating […]

Related Product: MotionWatch

Publication Date: September 25, 2020

A phase 2a randomised, double-blind, placebo-controlled, parallel-group, add-on clinical trial of ebselen (SPI-1005) as a novel treatment for mania or hypomania

Rationale Lithium is an effective prophylactic and anti-manic treatment in bipolar disorder; however, its use is declining through perceived poor tolerance and toxicity. Lithium inhibits inositol monophosphatase (IMPase), a probable key therapeutic mechanism. The anti-inflammatory drug, ebselen, also inhibits IMPase and appears well-tolerated and safe. Objectives To assess the efficacy of adjunctive ebselen in mania […]

Related Product: MotionWatch

Publication Date: September 9, 2020

Test-retest reliability and concurrent validity of the Adapted Short QUestionnaire to ASsess Health-enhancing physical activity (Adapted-SQUASH) in adults with disabilities

The current study determined the test-retest reliability and concurrent validity of the Adapted Short QUestionnaire to ASsess Health-enhancing physical activity (Adapted-SQUASH) in adults with disabilities. Before filling in the Adapted-SQUASH twice with a recall period of two weeks, participants wore the Actiheart activity monitor up to one week. For the test-retest reliability (N=68), Intraclass correlation […]

Related Product: Actiheart

Publication Date: September 9, 2020

Prediction of individual differences in circadian adaptation to night work among older adults: application of a mathematical model using individual sleep-wake and light exposure data

Circadian misalignment remains a distinct challenge for night shift workers. Variability in individual sleep-wake/light-dark patterns might contribute to individual differences in circadian alignment in night shift workers. In this simulation study, we compared the predicted phase shift from a mathematical model of the effect of light on the human circadian pacemaker to the observed melatonin […]

Related Product: MotionWatch

Publication Date: September 6, 2020

Multiple sclerosis-related fatigue: the role of impaired corticospinal responses and heightened exercise fatigability

It is unclear whether motor fatigability and perceived fatigue share a common pathophysiology in people with multiple sclerosis (PwMS). This cross-sectional investigation explored the relationship between the mechanisms of motor fatigability from cycling and fatigue severity in PwMS. Thirteen highly fatigued (HF) and thirteen non-fatigued (LF) PwMS, and thirteen healthy controls (CON) completed a step-test […]

Related Product: MotionWatch

Publication Date: September 2, 2020

Use of actigraphy and sleep diaries to assess sleep and academic performance in pharmacy students

Introduction Sleep parameters have been shown to correlate with academic performance. Current studies assessing sleep in doctor of pharmacy (PharmD) students rely on self-reported sleep parameters and academic performance. The objectives of this study were to describe and compare sleep parameters in pharmacy students using actigraphy and sleep diaries and to assess the correlation of […]

Related Product: MotionWatch

Publication Date: August 30, 2020

An Automatic Estimation of the Rest-Interval for MotionWatch8© Using Uniaxial Movement and Lux Data

Poor sleep is linked with chronic conditions common in older adults, including diabetes, heart disease, and dementia. Valid and reliable field methods to objectively measure sleep are thus greatly needed to examine how poor sleep impacts older adults. Wrist-worn actigraphy (WWA) is a common objective measure of sleep that uses motion and illuminance data to […]

Related Product: MotionWatch

Publication Date: August 24, 2020

Determinants of physical activity in young wheelchair-user with spina bifida

Objective: To explore associations between physical activity and peak oxygen uptake (VO2peak), age, sex, and Hoffer classification in young wheelchair-users with spina bifida. Design: Exploratory study. Subjects: Dutch children (age 5-19 years) with spina bifida who use a manual wheelchair. Methods: For the dependent variable physical activity, data from 2 physical activity monitors were analysed: […]

Related Product: Actiheart

Publication Date: August 17, 2020

Binocular Vision, Visual Function, and Pupil Dynamics in People Living With Dementia and Their Relation to the Rate of Cognitive Decline and Structural Changes Within the Brain: Protocol for an Observational Study

Background: Visual impairment is a common comorbidity in people living with dementia. Addressing sources of visual difficulties can have a significant impact on the quality of life for people living with dementia and their caregivers. Depth perception problems are purportedly common in dementia and also contribute to falls, visuomotor task difficulties, and poorer psychosocial well-being. […]

Related Product: MotionWatch

Publication Date: August 10, 2020

Local increases in sleep-like activity predict the occurrence of emotion suppression failures

Emotion self-regulation relies both on cognitive and behavioral strategies implemented to modulate the subjective experience and/or the behavioral expression of a given emotion. While it is known that a network encompassing fronto-cingulate and parietal brain areas is engaged during successful emotion regulation, the functional mechanisms underlying failures in emotion suppression are still unclear. In order […]

Related Product: MotionWatch

Publication Date: August 5, 2020

Active women demonstrate acute autonomic and hemodynamic shifts following exercise in heat and humidity: A pilot study

The purpose of this study was to assess autonomic and hemodynamic recovery in women who performed moderate-intensity exercise in heat. Seven women (31.7 ± 7.6 years, 67.5 ± 4.4 kg, 25.7 ± 5.6% Fat, 43.9 ± 5.1 mL/kg/min) completed two identical bouts of graded treadmill walking (~60% VO2peak). One bout was hot (37.5 ± 1.4°C, […]

Related Product: Actiheart

Publication Date: August 4, 2020

Two weeks of early time-restricted feeding (eTRF) improves skeletal muscle insulin and anabolic sensitivity in healthy men

Background Altering the temporal distribution of energy intake (EI) and introducing periods of intermittent fasting (IF) exert important metabolic effects. Restricting EI to earlier in the day [early time-restricted feeding (eTRF)] is a novel type of IF. Objectives We assessed the chronic effects of eTRF compared with an energy-matched control on whole-body and skeletal muscle […]

Related Product: Actiheart

Publication Date: July 30, 2020

Fatigue in patients with hereditary neuropathy with liability to pressure palsies

Objective Hereditary Neuropathy with Liability to Pressure Palsies (HNPP) is caused by a heterozygous deletion of peripheral myelin protein‐22 (PMP22) gene resulting in focal sensorimotor deficits. Our lab has identified a disruption of myelin junctions in excessively permeable myelin that impairs action potential propagation. This mechanism is expected to cause fatigue in patients with HNPP. […]

Related Product: PRO-Diary

Publication Date: July 28, 2020

Infusion of donor feces affects the gut-brain axis in humans with metabolic syndrome

Objectives Increasing evidence indicates that intestinal microbiota play a role in diverse metabolic processes via intestinal butyrate production. Human bariatric surgery data suggest that the gut-brain axis is also involved in this process, but the underlying mechanisms remain unknown. Design We compared the effect of fecal microbiota transfer (FMT) from post-Roux-en-Y gastric bypass (RYGB) donors […]

Related Product: Actiheart

Publication Date: July 3, 2020

Resting heart rate as a biomarker for tracking change in cardiorespiratory fitness of UK adults: The Fenland Study

Aims Resting heart rate (RHR) is inversely associated with cardiorespiratory fitness (CRF) but few studies have investigated the nature of this relationship in large population samples. We examined the association between RHR and CRF in UK adults and explored factors that may influence this relationship. Methods and Results In a population-based sample of 5,143 men […]

Related Product: Actiheart

Publication Date: July 2, 2020

Incorporating physiology into the study of psychotherapy process

Increasing evidence indicates that psychological factors important to therapy effectiveness are associated with physiological activity. Knowledge of the physiological correlates of therapy process variables has the potential to provide unique insights into how and why therapy works, but little is currently known about the physiological underpinnings of specific therapy processes that facilitate client growth and […]

Related Product: Actiheart

Publication Date: July 1, 2020

Reduced Neuromuscular Performance in Night Shift Orthopedic Nurses: New Insights From a Combined Electromyographic and Force Signals Approach

The effect of sleep–wake rhythm disruption on neuromuscular control and muscle fatigue has received little attention. Because nurse shift work is so varied, including overnight duty, rotating shift schedules, early awakening, and interrupted nocturnal sleep, it offers an interesting model to study this paradigm. It has been investigated so far using only subjective markers. A […]

Related Product: MotionWatch

Publication Date: June 30, 2020

Use of the Actiwatch-Mini® in dog safety studies as an early indicator for drug-induced behavioural changes

Introduction Clinical observations are routinely used to address drug-induced behavioural changes in dogs. To deal with the limitations of this methodology, we evaluated Actiwatch-Mini® as a tool to monitor continuously locomotor activity in dogs and to provide objective parameters that could be linked to behavioural changes after compound administration. Methods Eight Beagles were equipped with […]

Related Product: Actiwatch Mini

Publication Date: June 26, 2020

The clinical relevance of early identification and treatment of sleep disorders in mental health care: protocol of a randomized control trial

Background Sleep disorders are a risk factor for developing a variety of mental disorders, have a negative impact on their remission rates and increase the risk of relapse. Early identification and treatment of sleep disorders is therefore of paramount importance. Unfortunately, in mental health care sleep disorders are often poorly recognized and specific treatment frequently […]

Related Product: MotionWatch

Publication Date: June 24, 2020

Disturbances of Continuous Sleep and Circadian Rhythms Account for Behavioral Difficulties in Children with Autism Spectrum Disorder

Sleep disorders are among the most common comorbidities in children with Autism Spectrum Disorder (ASD), and subjectively defined sleep disturbances have been related to ASD symptom severity. However, no study has investigated the differential impact of objectively measured sleep and circadian rhythm disturbances on behavioral difficulties in this population. Fifty-two children with ASD aged 3–10 […]

Related Product: MotionWatch

Publication Date: June 24, 2020

Is disruption of sleep quality a consequence of severe Covid-19 infection?

The Covid-19 outbreak put enormous stress on the health system worldwide, and objective data to handle the emergency are still needed. We aimed to objectively assess the consequence of severe symptoms of Covid-19 infection on sleep quality through wrist actigraphy monitoring of four patients during the sub-acute recovery stage of the disease. The sleep of […]

Related Product: MotionWatch

Publication Date: June 23, 2020

Using Mobile Electroencephalography and Actigraphy to Diagnose Attention-Deficit/Hyperactivity Disorder: Case-Control Comparison Study

Background: Children with attention-deficit/hyperactivity disorder (ADHD), a neurobehavioral disorder, display behaviors of inattention, hyperactivity, or impulsivity, which can affect their ability to learn and establish proper family and social relationships. Various tools are currently used by child and adolescent psychiatric clinics to diagnose, evaluate, and collect information and data. The tools allow professional physicians to […]

Related Product: MotionWatch

Publication Date: June 19, 2020

A pragmatic approach to the comparison of wrist-based cutpoints of physical activity intensity for the MotionWatch8 accelerometer in children

Background A variety of wearable monitors are available for objectively assessing physical activity but there is a lack of established values for the activity intensity of MotionWatch8 (MW8) and a similar lack of studies on comparability across devices. Our study aimed to establish activity intensity cutpoints for the MW8 accelerometer in children, which are necessary […]

Related Product: MotionWatch

Publication Date: June 19, 2020

Toward a Better Understanding of the Reciprocal Relations Between Adolescent Psychological Need Experiences and Sleep

In two diary studies, we examined the reciprocal daily association between the satisfaction and frustration of adolescents’ basic psychological needs and sleep, and the role of stress and fatigue in these associations. In Study 1 (N = 211; 52% female; Mage = 15.86 years, SD = 1.18 years), daily need experiences were unrelated to daily […]

Related Product: MotionWatch

Publication Date: June 19, 2020

Sleep deprivation: Cytokine and neuroendocrine effects on perception of effort

Introduction: An increased perception of effort and subjective fatigue are thought to be central to decreased exercise performance observed following disrupted sleep. However, there is limited understanding of the mechanisms which underpin these phenomena. We investigated the role of interleukin-6 (IL-6), the soluble interleukin-6 receptor (sIL-6R)) and neuroendocrine factors (cortisol, adrenaline, noradrenaline and brain derived […]

Related Product: Actiheart

Publication Date: June 17, 2020

Leptin and the Retinal Microvasculature in Young Black and White Adults: The African-PREDICT Study

Background Leptin is a vasoactive peptide that has been linked to diseases associated with macrovascular deterioration. What is still uncertain is its involvement in the microvasculature. Since microvascular changes are presumed to precede macrovascular deterioration, we examined whether measures of the retinal microvasculature are associated with leptin in healthy, young Black and White individuals. Method […]

Related Product: Actiheart

Publication Date: June 13, 2020

Heart rate variability and long chain n-3 PUFA in patients with chronic kidney disease commencing haemodialysis: a cross-sectional study

The risk of sudden cardiac death (SCD) is doubled when a patient with chronic kidney disease (CKD) stage 5 starts haemodialysis. Low heart rate variability (HRV) has been reported to be independently associated with increased risk of SCD and all cardiac death in haemodialysis patients. Long chain n-3 polyunsaturated fatty acids (LC n-3 PUFA; 20:5n-3, […]

Related Product: Actiheart

Publication Date: June 10, 2020

Exploring human trainability: Design and rationale of studies of twin responses to understand exercise as a THerapy (STRUETH) study

Background Exercise confers myriad health benefits and physical inactivity is a modifiable risk factor for many non-communicable chronic diseases. However, individual responsiveness to guideline-based exercise programs is idiosyncratic for health and fitness outcomes. It is not known whether the response of individuals to distinct exercise modalities tend to be concordant or whether there is a […]

Related Product: Actiheart

Publication Date: June 9, 2020

Light effects on circadian and homeostatic regulation: alertness increases independent of time awake

Study Objectives To determine how sleepiness and sleep deprivation drive the motivation to engage in different behaviors. Methods We studied the sleepiness of 123 participants who had been randomized to sleep deprivation or normal sleep, and their willingness to engage in a range of everyday behaviors. Results Self-reported sleepiness was a strong predictor of the […]

Related Product: MotionWatch

Publication Date: June 6, 2020

Early manifestation of sleep problems in toddlers with Williams Syndrome using a mixed method longitudinal approach

Children with neurodevelopmental disorders commonly experience sleep problems. Williams Syndrome (WS), a rare genetic disorder characterised by a complex, uneven cognitive profile, is no exception. Compared with children with typical development (TD), school-aged children with WS experience significant sleep disruption: shorter sleep duration, more night wakings, greater bedtime resistance and excessive daytime tiredness. In children […]

Related Product: MotionWatch

Publication Date: June 3, 2020

Sleep duration, sleep variability, and impairments of visual attention

Attentional networks are sensitive to sleep deprivation. However, variation in attentional performance as a function of normal sleep parameters is understudied. We examined whether attentional performance is influenced by (a) individual differences in sleep duration, (b) sleep duration variability, and/or (c) their interaction. A total of 57 healthy participants (61.4% female, Mage = 32.37 years, SD = 8.68) completed questionnaires, […]

Related Product: MotionWatch

Publication Date: June 1, 2020

The day-to-day reliability of peak fat oxidation and FATMAX

PURPOSE:Prior studies exploring the reliability of peak fat oxidation (PFO) and the intensity that elicits PFO (FATMAX) are often limited by small samples. This study characterised the reliability of PFO and FATMAX in a large cohort of healthy men and women. METHODS:Ninety-nine adults [49 women; age: 35 (11) years; [Formula: see text]O2peak: 42.2 (10.3) mL·kg […]

Related Product: Actiheart

Publication Date: June 1, 2020

Skeletal muscle of females and males with constitutional thinness: a low intramuscular lipid content and oxidative profile

Constitutional thinness (CT) is a non-pathological state of underweight. The present study aimed to explore skeletal muscle energy storage in individuals with constitutional thinness and to further characterize muscle phenotype at baseline and in response to overfeeding. Thirty subjects with CT (15 females, 15 males) and 31 normal-weight control subjects (16 females, 15 males) participated […]

Related Product: Actiheart

Publication Date: June 1, 2020

Can Special Light Glasses Reduce Sleepiness and Improve Sleep of Nightshift Workers? A Placebo-Controlled Explorative Field Study

Nightshift workers go against the natural sleep–wake rhythm. Light can shift the circadian clock but can also induce acute alertness. This placebo-controlled exploratory field study examined the effectiveness of light glasses to improve alertness while reducing the sleep complaints of hospital nurses working nightshifts. In a crossover within-subjects design, 23 nurses participated, using treatment glasses […]

Related Product: PRO-Diary

Publication Date: May 29, 2020

Rationale and Study Design of OUTSTEP‐HF: A Randomized Controlled Study to Assess the Effect of Sacubitril/Valsartan and Enalapril on Physical Activity measured by Accelerometry in Patients with Heart Failure with Reduced Ejection Fraction

Aim In PARADIGM‐HF, sacubitril/valsartan demonstrated superiority to enalapril in reducing mortality and morbidity in patients with heart failure (HF) with reduced ejection fraction (HFrEF). Several patient‐centred outcomes like improved physical activity and quality of life (QoL) have been emphasised as important therapy goals in HF management. OUTSTEP‐HF has been designed to evaluate the effects of […]

Related Product: MotionWatch

Publication Date: May 28, 2020

Gateways, Disparities, and Finals Week, Oh My! Translating Sleep Science from the Laboratory to the Classroom

Introduction Organic chemistry can be an insurmountable “gateway” course for otherwise-qualified students in pre-health pathways. Recent data indicate that organic chemistry increases drop-out risk for females and underrepresented minority students (URMs), raising the provocative possibility that sleep disparities are an underrecognized contributor to achievement gaps in gateway STEM courses. Methods In Study 1, 481 students […]

Related Product: MotionWatch

Publication Date: May 27, 2020

Subjective–objective sleep discrepancy in patients with insomnia during and after cognitive behavioural therapy: An actigraphy study

Although patients with insomnia often show a discrepancy between self‐reported and objective sleep parameters, the role of and change in this phenomenon during treatment remain unclear. The present study aimed to assess the effect of cognitive behavioural therapy for insomnia on subjective and objective sleep discrepancy of total sleep time, sleep‐onset latency and wake after […]

Related Product: MotionWatch

Publication Date: May 20, 2020

Effect of a Multimodal Lifestyle Intervention on Sleep and Cognitive Function in Older Adults with Probable Mild Cognitive Impairment and Poor Sleep: A Randomized Clinical Trial

Background:Poor sleep is common among older adults with mild cognitive impairment (MCI) and may contribute to further cognitive decline. Whether multimodal lifestyle intervention that combines bright light therapy (BLT), physical activity (PA), and good sleep hygiene can improve sleep in older adults with MCI and poor sleep is unknown. Objective:To assess the effect of a […]

Related Product: MotionWatch

Publication Date: May 19, 2020

Age-related cognitive decline in baboons: modeling the prodromal phase of Alzheimer’s disease and related dementias

The aging of brain cells and synaptic loss are the major underlying pathophysiological processes contributing to the progressive decline in cognitive functions and Alzheimer’s disease. The difference in cognitive performances observed between adult and aged subjects across species highlights the decline of brain systems with age. The inflection point in age-related cognitive decline is important […]

Related Product: Actiwatch Mini

Publication Date: May 19, 2020

Observation and interview-based diurnal sleepiness inventory for measurement of sleepiness in patients referred for narcolepsy or idiopathic hypersomnia

STUDY OBJECTIVES:First, to determine whether the three-item ODSI (Observation and interview based Diurnal Sleepiness Inventory) measures the degree of excessive daytime sleepiness (EDS) in patients with suspected narcolepsy or idiopathic hypersomnia (IH). Second, to assess the correlation between the ODSI and the Epworth Sleepiness Scale (ESS) as well as objective polysomnographic measurements. Third, to test […]

Related Product: MotionWatch

Publication Date: May 14, 2020

Feasibility of a complex setting for assessing sleep and circadian rhythmicity in a Fragile X cohort

Introduction Sleep, circadian rhythms, (mental) health, and development are assumed to be intertwined. However, differentiated and reliable parameters of sleep and circadian rhythms are particularly difficult to assess for Fragile X (FXS) individuals. As those parameters need to be observed in complex settings, the feasibility of measurements for people with FXS was to be proven. […]

Related Product: MotionWatch

Publication Date: May 14, 2020

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