Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: A Systematic Review of Human Challenge Trials, Designs, and Safety
Multiple SARS-CoV-2 variants escape neutralization by vaccine-induced humoral immunity
Spatio-temporal analysis between the incidence of COVID-19 and human development in Mato Grosso do Sul, Brazil.
Estimating the Burden of SARS-CoV-2 among the Rohingya Refugees
Men and loneliness in the Covid-19 pandemic: insights from an interview study with UK-based men
Informal Sector Employment and the Health Outcomes of Older Workers in India
Framework for prioritizing variants of unknown significance from clinical genetic testing in kidney disease: utility of multidisciplinary approach to gather evidence of pathogenicity for Hepatocyte Nuclear Factor-1 (HNF1B) p.Arg303His
Understanding Barriers to Diagnosis in a Rare, Genetic Disease: Delays and Errors Diagnosing Schwannomatosis
School start times and academic achievement - a systematic review on grades and test scores
Systematic review and meta-analysis of randomized trials of hydroxychloroquine for the prevention of COVID-19
A Comparative Study on the knowledge and attitude of COVID-19 among Urban and Rural populations of Bangladesh.
Using time use diaries to track changing behavior across successive stages of COVID-19 social restrictions
Bacterial superinfection pneumonia in SARS-CoV-2 respiratory failure
International comparison of the impact of the pandemic and vaccination measures adopted on children and adolescent population
Quality Assurance Assessment of Diffusion-Weighted and T2-Weighted Magnetic Resonance Imaging Registration and Contour Propagation for Head and Neck Cancer Radiotherapy
Epidemiological topology data analysis links severe COVID-19 to RAAS andhyperlipidemia associated metabolic syndrome conditions
The effect of a specialist paramedic primary care rotation on appropriate non-conveyance decisions (SPRAINED) study: a controlled interrupted time series analysis
Deprivation and Early Involuntary Retirement: Area-Level Analysis across English Local Authorities
A Flexible Statistical Framework for Estimating Excess Mortality
Public attitudes to COVID-19 vaccines: A qualitative study
COVID-19 is associated with multiple sclerosis exacerbations that are prevented by disease modifying therapies
Antipsychotic Polypharmacy and Adverse Drug Reactions Among Adults in a London Mental Health Service, 2008-2018
Pulsed electromagnetic fields can prevent bone loss and improve balance function in older adults with primary osteoporosis: a systematic review and meta-analysis
Trend and Weightage of Problem-based Questions in Undergraduate Pharmacology Written Question Papers of Bangladesh
Decoding hand and wrist movement intention from chronic stroke survivors with hemiparesis using a wearable neural interface
Strategies to investigate and mitigate collider bias in genetic and Mendelian randomization studies of disease progression