Instruct: Identify the main category of the given Medrxiv paper based on its title.
Query: COVID-19 and Vitamin D (Co-VIVID Study): a systematic review and meta-analysis of randomized controlled trials
Genome Recombination between Delta and Alpha Variants of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)
Mortality in cancer patients with congenital anomalies across different age groups: trend analysis and prognostic risk factors
Coughs, Colds and "Freshers' Flu" Survey in the University of Cambridge, 2007-2008
Interleukin-33 stimulates stress in the endoplasmic reticulum of the human myometrium via an influx of calcium during initiation of labor
Implementing Building-Level SARS-CoV-2 Wastewater Surveillance on a University Campus
The Association of Marital/Partner Status with Patient-Reported Health Outcomes Following Acute Myocardial Infarction or Stroke: Protocol for a Systematic Review and Meta-analysis
Relationships of Prescription Opioid Sales to Opiate Treatment Admissions and Overdose Deaths: A Reanalysis of Relationships -- United States 2010-2019
Using high effective risk of Adult-Senior duo in multigenerational homes to prioritize COVID-19 vaccination
The impact of customized head molds on motion and motion-related artifacts from structural and functional MRI scans in children
Plans to vaccinate children for COVID-19: a survey of US parents
Assisted partner services for people who inject drugs: Index characteristics associated with untreated HIV in partners
Mechanisms linking physical activity with psychiatric symptoms: a protocol for a systematic review.
'Like brushing teeth' - Implementation experiences with opt-in, at-home screening for SARS-CoV-2 among schoolchildren in Germany
Changes in live births, preterm birth, low birth weight, and cesarean deliveries in the United States during the SARS-CoV-2 pandemic
COVID-19 vaccine response in people with multiple sclerosis
Prevalence of diabetes and prediabetes among Bangladeshi adults and associated factors: Evidence from the Demographic and Health Survey, 2017-18
Protocol for a mixed methods exploratory study of success factors to escalation of care: the SUFFICE study
Novel Application of a Force Sensor during Sit-to-Stands to Measure Dynamic Cerebral Autoregulation Onset
Comparing a new device to measure lung volumes with three traditional methods in individuals with different lung conditions
PBPK-led guidance for cystic fibrosis patients taking elexacaftor-tezacaftor-ivacaftor with nirmatrelvir-ritonavir for the treatment of COVID-19
Silica-encapsulated DNA tracers for measuring aerosol distribution dynamics in real-world settings
Pre-existing polymerase-specific T cells expand in abortive seronegative SARS-CoV-2 infection
A multi-level investigation of the genetic relationship between endometriosis and ovarian cancer histotypes
Heart rate variability as biomarker for bipolar disorder
Effects of Side-Effect Risk Framing Strategies on COVID-19 Vaccine Intentions in the United States and the United Kingdom: A Randomized Controlled Trial