Instruct: Identify the main category of the given medRxiv paper based on its title.
Query: Private Equity Acquisition in Ophthalmology and Optometry: A Time Series Analysis of the Pre-COVID, COVID Pre-Vaccine, and COVID Post-Vaccine Eras
Peripheral optical coherence tomography assisted by scleral depression in retinopathy of prematurity
Immunogenicity and adverse events of priming with inactivated whole SARS-CoV-2 vaccine (CoronaVac) followed by boosting the ChAdOx1 nCoV-19 vaccine
Prevalence mapping of Schistosomiasis among Pre-school aged children in Rwanda
Smoking and Vaping Among a National Sample of U.S. Adults During the COVID-19 Pandemic
Blood Gene Expression Risk Profiles and Interstitial Lung Abnormalities: COPDGene and ECLIPSE cohort studies
Methadone overdoses increased 48% during the COVID-19 epidemic
Is Second dose of vaccination useful in previously SARS-CoV-2 infected Health Care Workers?
High failure rate of ChAdOx1 in healthcare workers during Delta variant surge: A case for continued use of masks post-vaccination
Long-term symptoms after SARS-CoV-2 infection in school children: population-based cohort with 6-months follow-up. Short Report
Modelling, Simulations and Analysis of the First and Second COVID-19 Epidemics in Beijing
Infrequent intranasal oxytocin followed by positive social interaction improves symptoms in autistic children: a pilot randomized clinical trial
Predictors of COVID-19 vaccine hesitancy in the UK Household Longitudinal Study
Mucosal memory T cells in breastmilk are modulated by SARS-CoV-2 mRNA vaccination
Effect of a single dose of 8 mg moxidectin or 150 μg/kg ivermectin on O. volvulus skin microfilariae in a randomized trial: Differences between areas in the Democratic Republic of the Congo, Liberia and Ghana and impact of intensity of infection
Observational study of HPV genitalia and oral infection in an unvaccinated population of men who have sex with men infected with HIV in Northwest Spain
Immune profile and responses of a novel Dengue DNA vaccine encoding EDIII-NS1 consensus design based on Indo-African sequences
Cryptic transmission of SARS-CoV-2 and the first COVID-19 wave in Europe and the United States
Large-scale study of antibody titer decay following BNT162b2 mRNA vaccine or SARS-CoV-2 infection
Genomic reconstruction of the SARS-CoV-2 epidemic across England from September 2020 to May 2021
Multi-ancestry meta-analysis identifies 2 novel loci associated with ischemic stroke and reveals heterogeneity of effects between sexes and ancestries
Modeling COVID-19 care capacity in a major health system
Virological and serological kinetics of SARS-CoV-2 Delta variant vaccine-breakthrough infections: a multi-center cohort study
Wastewater to clinical case (WC) ratio of COVID-19 identifies insufficient clinical testing, onset of new variants of concern and population immunity in urban communities
Modeling Prenatal Adversity/Advantage: Effects on Birth Weight
An evaluation of toxigenic Clostridioides difficile positivity as a patient outcome metric of antimicrobial stewardship in Saudi Arabia