Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: Exploring Risks of Human Challenge Trials for COVID-19
Effective post-exposure prophylaxis of Covid-19 associated with hydroxychloroquine: Prospective dataset re-analysis incorporating novel, missing data
Geographic clusters of objectively measured physical activity and the characteristics of their built environment in a Swiss urban area
Statistical and functional convergence of common and rare variant risk for autism spectrum disorders at chromosome 16p
COVID-19 vaccine-associated cerebral venous thrombosis in Germany: a descriptive study
Longitudinal profiling of circulating tumour DNA for tracking tumour dynamics in pancreatic cancer
Urine test predicts kidney injury and death in COVID-19
External control arm analysis: an evaluation of propensity score approaches, G-computation, and doubly debiased machine learning.
Causal attribution of smoking and BMI to the landscape of disease incidence in UK Biobank
Vaccine safety surveillance using routinely collected healthcare data - An empirical evaluation of epidemiological designs
Plasma lipidomics identifies a signature of NAFLD in children that couples with cardiometabolic outcomes in adults
A two-stage super learner for healthcare expenditures
Essential Workers COVID-19 Vaccine Hesitancy, Misinformation and Informational Needs in the Republic of North Macedonia.
Analytical performance of a highly sensitive system to detect gene variants using next-generation sequencing for lung cancer companion diagnostics
Large household reduces dementia mortality.
Vegetable intake and cardiovascular risk: genetic evidence from Mendelian randomization
Unexplained Dyspnea and Cardiopulmonary Exercise Testing: Rationale for a Dyspnea Clinic
Low uptake of COVID-19 lateral flow testing among university students: a mixed methods evaluation
MR Elastography-based tissue stiffness in glioblastomas is associated with reduced cerebral blood flow
The efficacy of vaccines in the context of COVID-19 and its variants: Role of Spatio-temporal boundary
Real-Time Electronic Health Record Mortality Prediction During the COVID-19 Pandemic: A Prospective Cohort Study
Widespread cell stress and mitochondrial dysfunction in early Alzheimers Disease
Redefining tissue specificity of genetic regulation of gene expression in the presence of allelic heterogeneity
Specific heterozygous frameshift variants in hnRNPA2B1 cause early-onset oculopharyngeal muscular dystrophy
Heterologous vaccination with inactivated and mRNA vaccines increases B and T cell responses to SARS-CoV-2
HbA1c and FIB-4 as Serologic Markers for the Risk of Progression of Stage A Heart Failure