Instruct: Identify the main category of the given Medrxiv paper based on its title.
Query: Effectiveness of Covid-19 Vaccines in the United States Over 9 Months: Surveillance Data from the State of North Carolina
Biomarkers of endothelial dysfunction and outcomes in coronavirus disease 2019 (COVID-19) patients: a systematic review and meta-analysis
MRI connectivity-based spread of microglial activation in early Alzheimer's disease
Deafferentation of Olfactory Bulb in Subjects Dying with COVID-19
Emergence and spread of a SARS-CoV-2 variant through Europe in the summer of 2020
Performance of Heart Failure Clinical Prediction Models: A Systematic External Validation Study
COVID-19 seroprevalence among healthcare workers of a large COVID Hospital in Rome reveals strengths and limits of two different serological tests
External validation of risk scores to predict in-hospital mortality in patients hospitalized due to coronavirus disease 2019.
Rare coding variation illuminates the allelic architecture, risk genes, cellular expression patterns, and phenotypic context of autism
THE IMPACT OF ROUTINES ON EMOTIONAL AND BEHAVIOURAL DIFFICULTIES IN CHILDREN AND ON PARENTAL ANXIETY DURING COVID-19
The Morbidity Costs of Air Pollution through the Lens of Health Spending in China
Real-world experience with tofacitinib in ulcerative colitis - a systematic review and meta-analysis
Characterization of small fiber neuropathy in hypermobile Ehlers Danlos Syndrome
VaxiMap: optimal delivery of vaccinations for housebound patients
Trends, wealth inequalities and the role of the private sector in caesarean section in the Middle East and North Africa: a repeat cross-sectional analysis of population-based surveys
Timing of Convalescent plasma administration and 28-day mortality for COVID-19 pneumonia.
Structural adjustment programmes and infectious disease mortality
Baptism of fire: Modeling the effects of prescribed fire on tick-borne disease
Vital signs as a source of racial bias
Impact of the Tier system on SARS-CoV-2 transmission in the UK between the first and second national lockdowns
Radiographic evaluation of lumbar intervertebral disc height index: an intra and inter-rater agreement and reliability study
Elevated circulating CD16+ monocytes and TLR4+ monocytes in older adults with multiple cardiometabolic disease risk factors
Longitudinal analysis of UK Biobank participants suggests age and APOE-dependent alterations of energy metabolism in development of dementia
Domiciliary high-flow nasal cannula oxygen therapy for stable hypercapnic COPD patients: a prospective, multicenter, open-label, randomized controlled trial
Transmission of SARS-CoV-2 in Norwegian schools: A population-wide register-based cohort study on characteristics of the index case and secondary attack rates
Variation at Spike position 142 in SARS-CoV-2 Delta genomes is a technical artifact caused by dropout of a sequencing amplicon