Instruct: Identify the main category of the given medRxiv paper based on its title.
Query: Unexposed populations and potential COVID-19 burden in European countries
A randomized clinical trial to stimulate the cholinergic anti-inflammatory pathway in patients with moderate COVID-19-pneumonia using a slow-paced breathing technique
Within-Day Variability of SARS-CoV-2 RNA in Municipal Wastewater Influent During Periods of Varying COVID-19 Prevalence and Positivity
Assessment of N95 respirator for reuse after sterilization: filtration efficacy, breathing resistance, quality factor, chemical structure and surface charge density
Economic evaluation of a cluster randomized, non-inferiority trial of differentiated service delivery models of HIV treatment in Zimbabwe
Minimal algorithms for knowledge representation in clinical decision support systems research: a theoretical and empirical analysis
CADM2 is implicated in impulsive personality and numerous other traits by genome- and phenome-wide association studies in humans, with further support from studies of Cadm2 mutant mice
Comorbid-phenome prediction and phenotype risk scores enhance gene discovery for generalized anxiety disorder and posttraumatic stress disorder
Trans-ancestry genome-wide association study identifies novel genetic mechanisms in rheumatoid arthritis
Population-level changes in the mental health of UK workers during the COVID-19 pandemic: A longitudinal study using Understanding Society
Prevalence and time trend of congenital heart defects: a registry-based study in Iran
Genetic modifiers of Huntington's disease differentially influence motor and cognitive domains
Variant-specific SARS-CoV-2 within-host kinetics
Increasing Trust in Real-World Evidence Through Evaluation of Observational Data Quality
Perfluoroalkyl substances are increased in patients with late-onset ulcerative colitis and induce intestinal barrier defects ex vivo in murine intestinal tissue
A case of autosomal dominant osteopetrosis type II with a severe bone phenotype but no amino acid converting mutation in the CLCN7 gene
How do growth and nutrition explain social inequalities in lung function in children with cystic fibrosis? A longitudinal mediation analysis using interventional disparity effects with time-varying mediators and intermediate confounders.
Mapping brain structural differences and neuroreceptor correlates in Parkinson's disease visual hallucinations: a mega-analysis
Quantifying meaningful usage of a SARS-CoV-2 exposure notification app on the campus of the University of Arizona
Methods for Estimation of SARS-CoV-2 Seroprevalence and Reported COVID-19 Cases in U.S. Children, August 2020 - May 2021
A cross-sectional analysis of demographic and behavioral risk factors of SARS-CoV-2 antibody positivity among a sample of U.S. college students
Cardiovascular disease protein biomarkers are associated with kidney function: the Framingham Heart Study
Intentions and willingness to engage in risky driving behaviour among high school adolescents: evaluating the bstreetsmart road safety program
Multi-ancestry omic Mendelian randomization revealing putative drug targets of COVID-19 severity
Colorectal Cancer Disparities: A Systematic Review and Meta-Analysis
The acoustic quality and health in urban environments (SALVE) project: Study design, rationale and methodology