Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: Using Twitter Data for Cohort Studies of Drug Safety in Pregnancy: A Proof-of-Concept with Beta-Blockers
Exploring the Feasibility of Using Real-World Data from a Large Clinical Data Research Network to Simulate Clinical Trials of Alzheimer's Disease
A Retrospective analysis of DIC score and SIC score in prediction of COVID-19 severity
Evaluating a polygenic hazard score to predict risk of developing metastatic or fatal prostate cancer in the multi-ancestry Million Veteran Program cohort
Reddit discussions about buprenorphine associated precipitated withdrawal in the era of fentanyl
Study on the mucosal and serological immune response to the Novel Coronavirus (SARS-CoV-2) vaccine
Contact patterns before and during the UK's Autumn 2020 COVID-19 lockdown among university students and staff
Psychosocial factors associated with mental health and quality of life during the COVID-19 pandemic among low-income urban dwellers in Peninsular Malaysia
Statistical Inferences and Analysis based on the COVID-19 data from the United States
Multimorbidity and its associated risk factors among the older adults in India
Characterizing Potential Conflicts of Interest Among UpToDate and DynaMed Content Contributors
Proof-of-principle neural network models for classification, attribution, creation, style-mixing, and morphing of image data for genetic conditions
SARS-CoV-2 DNA Vaccine INO-4800 Induces Durable Immune Responses Capable of Being Boosted in a Phase 1 Open-Label Trial
Respiratory Syncytial Virus (RSV) RNA in wastewater settled solids reflects RSV clinical positivity rates
The rise and fall of an emerging SARS-CoV-2 variant with the spike protein mutation L452R
Post-stroke executive function impairments in relation to white matter damage due to stroke lesions versus leukoaraiosis
Tenofovir-DF versus Hydroxychloroquine in the Treatment of Hospitalized Patients with COVID-19: An Observational Study (THEDICOV)
Associations between different tau-PET patterns and longitudinal atrophy in the Alzheimer's disease continuum
Low grade systemic inflammation is a risk factor for infection death: an observational cohort study
Acceptance of COVID 19 vaccine among sub-Sahara African (SSA): a comparative study of residents and diaspora dwellers
Unravelling the link between sleep and mental health during the COVID-19 pandemic
Prediction of vaccine efficacy of the Delta variant
Impact on Mental Health of students due to restriction caused by COVID-19 pandemic: Cross-sectional study
Reliable assessment of in vitro SARS-CoV-2 infectivity by a Rapid Antigen Detection Test
Trends of Cutaneous Leishmaniasis, Western Ethiopia: retrospective study.
Evolution of SARS-CoV-2 seroprevalence and clusters in school children from June 2020 to April 2021 reflect community transmission: prospective cohort study Ciao Corona