Instruct: Identify the main category of the given medRxiv paper based on its title.
Query: Are vaccines safe in patients with Long COVID? A prospective observational study.
Biochemical, Biophysical, and Immunological Characterization of Respiratory Secretions in Severe SARS-CoV-2 (COVID-19) Infections
Von Meyenburg Complexes and Malignancy: A Systematic Review
Bias amplification of unobserved confounding in pharmacoepidemiological studies using indication-based sampling: there is no free lunch in restricting the sample to those with a particular drug-indication
Reproduction as a Means of Evaluating Policy Models: A Case Study of a COVID-19 Simulation
Trajectories of child emotional and behavioural difficulties before and during the COVID-19 pandemic in a longitudinal UK cohort
Loneliness and the onset of new mental health problems in the general population: a systematic review
A novel SEIR-e model for disease transmission and pathogen exposure
Multi-state network meta-analysis of cause-specific survival data
Effects of Confounding Bias in COVID-19 and Influenza Vaccine Effectiveness Test-Negative Designs Due to Correlated Influenza and COVID-19 Vaccination Behaviors
Development, validation, and evaluation of prediction models to identify individuals at high risk of lung cancer for screening in the English primary care population using the QResearch database: research protocol and statistical analysis plan
High SARS-CoV-2 attack rates following exposure during five singing events in the Netherlands, September-October 2020
A scoping review protocol on in vivo human plastic exposure and health impacts
Seroprevalence of SARS-CoV-2 antibodies prior to the widespread introduction of vaccine programmes in the WHO European Region, January - December 2020: a systematic review
Brain Tumor Detection Using Deep Learning
Awareness and perceptions among members of a Japanese cancer patient advocacy group concerning the financial relationships between the pharmaceutical industry and physicians: a mixed-methods analysis of survey data
Longitudinal experiences and impact of the COVID-19 pandemic among people with past or current eating disorders in Sweden
Substantial measurement error in a commercial multiple breath washout device
Coverage and Effectiveness of mRNA COVID-19 Vaccines among Veterans
The fMRI signature of acute catatonic state and its response to benzodiazepines
Willingness and influential factors of parents to vaccinate their children against the COVID-19: a systematic review and meta-analysis
Machine learning analysis reveals biomarkers for the detection of neurodegenerative diseases
Ordinal regression increases statistical power to predict epilepsy surgical outcomes
Acute exercise induces natural killer cell mobilization but not infiltration into prostate cancer tissue in humans
Spatio-temporal analysis and prediction of malaria cases using remote sensing meteorological data in Diebougou health district, Burkina Faso, 2016-2017
The National COVID Cohort Collaborative: Clinical Characterization and Early Severity Prediction