Instruct: Identify the main category of the given Medrxiv paper based on its title.
Query: Vascular complexity and severity of diabetic retinopathy by using swept-source optical coherence tomographic angiography
Partial recovery of amblyopia following fellow eye ischemic optic neuropathy
Program and patient characteristics for the United States Expanded Access Program to COVID-19 convalescent plasma
Substance abuse and the risk of severe COVID-19: Mendelian randomization confirms the causal role of opioids but hints a negative causal effect for cannabinoids.
Situation of COVID-19 in Brazil: An analysis via growth models as implemented in the ModInterv system for monitoring the pandemic
The efficacy of sampling strategies for estimating scabies prevalence
Real-world evaluation of AI driven COVID-19 triage for emergency admissions: External validation & operational assessment of lab-free and high-throughput screening solutions
The SENSOR System: Using Standardized Data Entry and Dashboards for Review of Scientific Studies Using the Clinical Applications of Psychedelics as an Illustration
Mathematical Modeling of Listeriosis Incorporating Effects of Awareness Programs
Tear antibodies to SARS-CoV-2: implications for transmission
Identifying Medication-related Intents from a Bidirectional Text Messaging Platform for Hypertension Management: An Unsupervised Learning Approach
SARS-CoV-2 seropositivity after infection and antibody response to mRNA-based vaccination
Reappraising Treatment Effect Heterogeneity in Schizophrenia: A Meta-analysis
An integrative analysis of clinical and epigenetic biomarkers of mortality
Compassionate Use of REGEN-COV(R) in Patients with COVID-19 and Immunodeficiency-Associated Antibody Disorders
BASELINE METABOLIC PROFILING AND RISK OF DEATH FROM COVID-19
Immunogenicity of Pfizer mRNA COVID-19 vaccination followed by J&J adenovirus COVID-19 vaccination in two CLL patients
Transmission event of SARS-CoV-2 Delta variant reveals multiple vaccine breakthrough infections
The age-stratified analytical model for the spread of the COVID-19 epidemic
Predicting daily COVID-19 case rates from SARS-CoV-2 RNA concentrations across a diversity of wastewater catchments
Animals in higher education settings: Do animal-assisted interventions improve mental and cognitive health outcomes of students?  A systematic review and meta-analysis
Differential effects of brain maintenance and cognitive reserve on age-related cognitive decline
Feeding Activated Bifidobacterium infantis EVC001 to Very Low Birth Weight Infants is Associated with Significant Reduction in Rates of Necrotizing Enterocolitis
Impact of close interpersonal contact on COVID-19 incidence: evidence from one year of mobile device data
Obesity, Ethnicity, and Covid-19 Mortality: A population-based cohort study of 12.6 Million Adults in England
Data-driven identification of health conditions associated with incident Alzheimer's disease dementia risk: a 15 years follow-up cohort from electronic health records in France and the United Kingdom