Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: Primary school staff perspectives of school closures due to COVID-19, experiences of schools reopening and recommendations for the future: a qualitative survey in Wales
Therapeutic of four antiviral drugs in treatment of COVID-19: A protocol for systematic review and Network Meta-analysis
Regional and temporal variations affect the accuracy of variant-specific SARS-CoV-2 PCR assays
A database of pediatric drug effects to evaluate ontogenic mechanisms from child growth and development
Trends in Fentanyl and Fentanyl Derivative Utilization in the United States
Simple Scoring Tool to Estimate Risk of Hospitalization and Mortality in Ambulatory and Emergency Department Patients with COVID-19
Interventional Neurorehabilitation for Promoting Functional Recovery Post-Craniotomy: A Proof-of-Concept
Efficacy of propolis as an adjunct treatment for hospitalized COVID-19 patients: a randomized, controlled clinical trial
Gender Affirming Hormone Therapy induces specific DNA methylation changes in blood
Polygenic predisposition to venous thromboembolism is associated with increased COVID-19 positive testing rates
The Mask-Wearing Bias In The Estimates Of Vaccine Efficacy
SARS-CoV-2-antibody response in health care workers after vaccination or natural infection in a longitudinal observational study
SARS-CoV-2 transmission in intercollegiate athletics not fully mitigated with daily antigen testing
Ranking videolaryngoscopes by orotracheal intubation performance: protocol of a systematic review and network meta-analysis of clinical trials at patient level.
The gut microbiome is a significant risk factor for future chronic lung disease
Differential expression of genes influencing mitotic processes in cord blood mononuclear cells after a pre-conceptional micronutrient-based randomized controlled trial: Pune Rural Intervention in Young Adolescents (PRIYA)
Hydroxychloroquine in the Pregnancies of Women with Lupus: A Meta-Analysis of Individual Participant Data
Acute and long-term impacts of COVID-19 on economic vulnerability: a population-based longitudinal study (COVIDENCE UK)
Exploring selection bias in COVID-19 research: Simulations and prospective analyses of two UK cohort studies
Mental Health During COVID-19: A Qualitative Study with Ethnically Diverse Healthcare Workers in the United Kingdom
Hydroxychloroquine Prophylaxis against Coronavirus Disease-19: Practice Outcomes among Health-Care Workers
Japan's Covid mitigation strategy and its epidemic prediction
Evaluation on the Effectiveness on the Implementation of WHO-CST Programme in Hong Kong: A RCT Protocol
Short-term effects of BNT162b2 mRNA COVID-19 vaccination on physiological measures: a prospective study
Molecular epidemiology of paediatric bloodstream infections caused by Gram-negative bacteria in Oxfordshire, UK
Mouth-rinses and SARS-CoV-2 viral load in saliva: A living systematic review