Instruct: Identify the main category of the given Medrxiv paper based on its title.
Query: Magnitude, global variation, and temporal development of the COVID-19 infection fatality burden
It's complicated: characterizing the time-varying relationship between cell phone mobility and COVID-19 spread in the US
A clinical trial to evaluate the dayzz smartphone app on employee sleep, health, and productivity at a large US employer
Triaging and Referring In Adjacent General and Emergency Departments (the TRIAGE trial): a cluster randomised controlled trial
Using remotely delivered Spring Forest Qigong to reduce neuropathic pain in adults with spinal cord injury: Protocol of a quasi-experimental clinical trial
Estimation of Vaccine Efficacy for Variants that Emerge After the Placebo Group Is Vaccinated
Assessment of Post COVID-19 Health Problems and its Determinants in North India: A descriptive cross section study
Spatiotemporal mapping of major trauma in Victoria, Australia
Artificial Intelligence System Reduces False-Positive Findings in the Interpretation of Breast Ultrasound Exams
The Use of Procalcitonin as an Antimicrobial Stewardship Tool and a Predictor of Disease Severity in COVID-19
Towards definitions of critical illness and critical care using concept analysis
Interest of seroprevalence surveys for the epidemiological surveillance of the SARS-CoV-2 pandemic in African populations: insights from the ARIACOV Project in Benin
Use of serology immunoassays for predicting SARS-CoV-2 infection: a serology-based diagnostic algorithm
Derivation of an electronic frailty index for short-term mortality in heart failure: a machine learning approach
Social-distancing Fatigue: Evidence from Real-time Crowd-sourced Traffic Data
Fear and death anxiety among Latin American doctors during the Covid-19 pandemic
A cross-sectional study of the association between frequency of telecommuting and unhealthy dietary habits among Japanese workers during the COVID-19 pandemic
An analysis of school absences in England during the Covid-19 pandemic
The cost of building an environmental surveillance system for typhoid
The effect of respiratory activity, ventilatory therapy and facemasks on total aerosol emissions
Sars-Cov-2 antibody titer 3 months post-vaccination is affected by age, gender, smoking and vitamin D.
MAGNITUDE AND DURABILITY OF THE EFFECT OF VACCINATION ON THE CASE FATALITY RATE FOR COVID-19
IMU-derived kinematics detect gait differences with age or knee osteoarthritis but differ from marker-derived inverse kinematics
Exploration of Alzheimer's Disease MRI Biomarkers Using APOE4 Carrier Status in the UK Biobank
Optimal allocation of vaccines - the role of childrens vaccination
Genomic epidemiology identifies emergence and rapid transmission of SARS-CoV-2 B.1.1.7 in the United States