Instruct: Identify the main category of Medrxiv papers based on their titles.
Query: Estimating typhoid incidence from community-based serosurveys:  A multicohort study in Bangladesh, Nepal, Pakistan and Ghana
Interrogating structural inequalities in COVID-19 Mortality in England and Wales
Follow the Money: A Closer Look at US Tobacco Industry Marketing Expenditures
Repeat Subcutaneous Administration of REGEN-COV(R) in Adults is Well-Tolerated and Prevents the Occurrence of COVID-19
Clinical Results with a B Cell Activating Anti-CD73 Antibody for the Immunotherapy of COVID-19
Mathematical modelling of COVID-19 vaccination strategies in Kyrgyzstan
Half year longitudinal seroprevalence of SARS-CoV-2-antibodies and rule compliance in German hospital employees
Molecular Profiling of COVID-19 Autopsies Uncovers Novel Disease Mechanisms
Automated identification of unstandardized medication data: A scalable and flexible data standardization pipeline using RxNorm on GEMINI multicenter hospital data
Grandfathers and Grandsons: Social Security Expansion and Child Health in China
Mobilefuge: A low-cost, portable, open source, 3D-printed centrifuge that can be used for purification of saliva samples for SARS-CoV2 detection
The United Kingdom Research study into Ethnicity And COVID-19 outcomes in Healthcare workers (UK-REACH): Protocol for a prospective longitudinal cohort study of healthcare and ancillary workers in UK healthcare settings
Cue-Induced Craving and Negative Emotion Disrupt Response Inhibition in Methamphetamine Use Disorder: Behavioral and fMRI Results from a Mixed Go/No-Go Task
Infrared spectroscopy enables rapid, robust, portable COVID-19 saliva screening based on pathophysiological response to SARS-CoV-2
Cohort Profile: A national prospective cohort study of SARS-CoV-2 pandemic outcomes in the U.S. - The CHASING COVID Cohort Study
NHS CHECK: protocol for a cohort study investigating the psychosocial impact of the COVID-19 pandemic on healthcare workers
Characterising post-COVID syndrome more than 6 months after acute infection in adults; prospective longitudinal cohort study, England
Current status and future opportunities in modeling Multiple Sclerosis clinical characteristics
Massive Open Online Course (MOOC) Opportunities on Health Education (HE) during of mandatory social isolation context
Development and validation of decision rules models to stratify coronary artery disease, diabetes, and hypertension risk in preventive care: cohort study of returning UK Biobank participants
System Integrated Digital Empowerment and Rehabilitation to promote patient Activation and well-Being (SIDERA^B): Protocol for a Randomized Crossover Trial on Effectiveness and Implementation.
Early introductions and community transmission of SARS-CoV-2 variant B.1.1.7 in the United States
Impact of body mass index on 5-year survival rates in patients undergoing allogeneic hematopoietic stem cell transplantation
Adaptive data-driven age and patch mixing in contact networks with recurrent mobility
Estimating treatment effect for individuals with progressive multiple sclerosis using deep learning
A Multilayer Model for Early Detection of COVID-19