Instruct: Identify the main category of the given medRxiv paper based on the title.
Query: Grouping theory of epidemiology
Emergence and spread of a SARS-CoV-2 variant through Europe in the summer of 2020
Analysis of key factors of a SARS-CoV-2 vaccination program: A mathematical modeling approach
Sodium intake and high blood pressure among adults on caloric restriction: a multi-year cross-sectional analysis of the U.S. Population, 2007-2018
The treatment of scaphoid non-unions with partial and total scaphoid in titanium custom-made 3D-printed prostheses and reconstruction of scapholunate interosseous ligament: a preliminary study
Impact of SARS-CoV-2 vaccination on systemic immune responses in people living with HIV
Reduced seroconversion in children compared to adults with mild COVID-19
Identification of clinical features associated with mortality in COVID-19 patients
Volumetric quantification of wound healing by machine learning and optical coherence tomography in adults with type 2 diabetes: the GC-SHEALD RCT
An Accurate and Explainable Deep Learning System Improves Interobserver Agreement in the Interpretation of Chest Radiograph
COVID-19 pandemic dynamics in South Africa and epidemiological characteristics of three variants of concern (Beta, Delta, and Omicron)
Early Analysis of a potential link between viral load and the N501Y mutation in the SARS-COV-2 spike protein
Unmet need of essential treatments for critical illness in Malawi
Development of Goal Management Training+ (GMT+) for methamphetamine use disorder through collaborative design: A process description
Athletes' access to, attitudes towards, and experiences of help-seeking for mental health: A scoping review protocol
Energy Insecurity Influences Urban Outdoor Air Pollution Levels during COVID-19 Lockdown in South-Central Chile
The COVID-19 pandemic amplified long-standing racial disparities in the United States criminal justice system
TARGET-HF: Developing a model for detecting incident heart failure among symptomatic patients in general practice using routine health care data
COVID-19 Patients Symptoms: Gastrointestinal Presentations, Comorbidities and Outcome in a Canadian Hospital setting
Predicting Adverse Drug Effects: A Heterogeneous Graph Convolution Network with a Multi-layer Perceptron Approach
Brain Injury in COVID-19 is Associated with Autoinflammation and Autoimmunity
Recovery from Covid-19 critical illness: a secondary analysis of the ISARIC4C CCP-UK cohort study and the RECOVER trial
Hospital mortality in COVID-19 patients in Belgium treated with statins, ACE inhibitors and/or ARBs
Nature and Trends of Pharmaceutical Payments to Board Certificated Respiratory Specialists in Japan between 2016 and 2019
Functional connectivity directionality between large-scale resting-state networks in children and adolescence from the Healthy Brain Network sample
Mid-term subclinical myocardial injury detection in patients recovered from COVID-19 according pulmonary lesion severity.