Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: COVID-19 mortality in the United States: It's been two Americas from the start
Pattern of Severity of Road Traffic Injuries Among Pedestrians in Low- and Middle-Income Countries: A Systematic Review
Social support, social strain and declines in verbal memory: 16-year follow-up of the English Longitudinal Study of Ageing cohort
Varenicline Versus Cytisine for Smoking Cessation in a Primary Care Setting: A Randomized Controlled Trial
How well does SARS-CoV-2 spread in hospitals?
Use of digital technology tools to characterize patient adherence to prescription-grade omega-3 polyunsaturated fatty acid therapy: Primary results of the DIAPAsOn prospective observational study
Comparing the results of the application of moving and stationary sinusoidal gratings in the functionally assisted treatment of meridional amblyopia
Geographic partitioning of dengue virus transmission risk in Florida
Cardiovascular diseases worsen the maternal prognosis of COVID-19
Analytic approaches to clinical validation of results from preclinical models of glioblastoma: a systematic review
A random forest model for forecasting regional COVID-19 cases utilizing reproduction number estimates and demographic data
SARS-CoV-2 Transmission Potential and Policy Changes in South Carolina, February 2020 - January 2021
BASELINE METABOLIC PROFILING AND RISK OF DEATH FROM COVID-19
Resilient T cell responses to B.1.1.529 (Omicron) SARS-CoV-2 variant
Dupilumab use is associated with protection from COVID-19 mortality: A retrospective analysis.
SARS-CoV2 sero-survey among adults involved in health care and health research in Guinea-Bissau, West Africa
Histopathological assessments reveal retinal vascular changes, inflammation, and gliosis in patients with lethal COVID-19
Circulating Plasma Biomarkers in Biopsy-Confirmed Kidney Disease: Results from the Boston Kidney Biopsy Cohort
Analysis of MRI-derived spleen iron in the UK Biobank identifies genetic variation linked to iron homeostasis and erythrocyte morphology
Non-Invasive Prenatal Testing (NIPT) Results for Participants of the eXtraordinarY Babies Study: Screening, Counseling, Diagnosis, and Discordance
Surface and air contamination with SARS-CoV-2 from hospitalized COVID-19 patients in Toronto, Canada
Biliary Duct Hamartomas: A Systematic Review
Single-Blind and Double-Blind Peer Review: Effects on National Representation
Head, facial and neck cooling as per-cooling modalities to improve exercise performance in the heat: A narrative review and practical applications
Oxidative stress and antioxidant defenses in mild cognitive impairment: a systematic review and meta-analysis.
Leveraging large multi-center cohorts of Alzheimer Disease endophenotypes to understand the role of Klotho heterozygosity on disease risk