Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: Conditionality of COVID-19 vaccine acceptance in European countries
Who was wearing a mask in 2021? Update on gender-, age-, and location-related differences during the COVID-19 pandemic
Recent trends in postoperative mortality after liver resection- A systemic review and metanalysis of studies published in last 5 years and metaregression of various factors affecting 90 days mortality.
Preterm birth, stillbirth, and early neonatal mortality during the Danish COVID-19 lockdown
Data-Driven Real-Time Strategic Placement of Mobile Vaccine Distribution Sites
Sustained SARS-CoV-2 seroprevalence and related hematological features in asymptomatic blood donors
PCR test positive rate revealing the real infection epidemic status examined in the COVID-19 epidemic in Tokyo, Japan
Using Facebook groups to support families: midwives perceptions and experiences of professional social media use
Development and Evaluation of a new Swiss Made SARS-CoV-2 antigen-detecting rapid test
COVID-19 mass testing: harnessing the power of wastewater epidemiology
Robust immune responses after one dose of BNT162b2 mRNA vaccine dose in SARS-CoV-2 experienced individuals
COVID-19 Vaccine Prioritisation in Japan and South Korea
Risks and challenges in COVID-19 infection prevention and control in a hospital setting: perspectives of healthcare workers in Thailand
Human and machine learning of prognostic prediction for prelabor rupture of membranes and the time of delivery: a nationwide development, validation, and deployment using medical history
Effectiveness of Face Masks in Blocking the Transmission of SARS-CoV-2: a Preliminary Evaluation of Masks Used by SARS-CoV-2-Infected Individuals
Opioids, Needle Exchange, and Barriers to Care in the Rural Context: Interviews with Law Enforcement and Emergency Medical Personnel
Common and Disorders-Specific Cortical Thickness Alterations in Internalizing, Externalizing and Thought Disorders in the Preadolescents of the ABCD Study
Polygenic and environmental determinants of tics in the Avon Longitudinal Study of Parents and Children cohort
DEVELOPMENT OF A CHATBOT TO IDENTIFY DEPRESSION THROUGH A QUESTIONNAIRE
Through The Back Door: Expiratory Accumulation of SARS-Cov-2 in the Olfactory Mucosa as Mechanism for CNS Penetration
Six-month sequelae of post-vaccination SARS-CoV-2 infection: a retrospective cohort study of 10,024 breakthrough infections
Segmental analysis in cervical spinal cord injury reveals the recovery potential of hand muscles with preserved corticospinal tract: Insights beyond impairment scales
Returning to the workplace during the COVID-19 pandemic: The concerns of Australian workers
Severity of COVID-19 reinfection and associated risk factors: findings of a cross-sectional study in Bangladesh
Plasma oxylipin profile discriminates ethnicities in subjects with Non-alcoholic steatohepatitis: An exploratory analysis
Challenges in defining Long COVID: Striking differences across literature, Electronic Health Records, and patient-reported information