Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: Cost saving in primary versus tertiary level of reproductive health services in Sana'a, Yemen
Value-based pricing of a COVID-19 vaccine
Differences in COVID-19 Risk by Race and County-Level Social Determinants of Health Among Veterans
Barriers to access to HIV care services in host countries: views and experiences of Indonesian male ex-migrant workers living with HIV
Empowering the crowd: Feasible strategies for epidemic management in high-density informal settlements. The case of COVID-19 in Northwest Syria
Cohort Study: The Accuracy of Screening Methods of COVID-19 in Pregnancy: Practical Approach in Low Resources Health Services
Impact of the household environment risk for maintenance of natural foci of Leishmania infantum transmission to human and animal hosts in endemic areas for visceral leishmaniasis in Sao Paulo State, Brazil
Risk of HCV infection associated with hospital-based invasive procedures: a systematic review and meta-analysis
Mental Health Concerns Related to the COVID-19 Pandemic on Twitter in the UK
The individual and combined associations of depression and socioeconomic status with risk of major cardiovascular events: a prospective cohort study
Model-based evaluation of alternative reactive class closure strategies against COVID-19
Safety and immunogenicity of a high-dose quadrivalent influenza vaccine administered concomitantly with a third dose of the mRNA-1273 SARS-CoV-2 vaccine in adults >= 65 years of age: a Phase II, open-label study
Fundamental limits on inferring epidemic resurgence in real time using effective reproduction numbers
Benchmark of thirteen bioinformatic pipelines for metagenomic virus diagnostics using datasets from clinical samples
Effectiveness and safety of PRP on persistent olfactory dysfunction related to COVID-19: towards a new therapeutic hope
COVID-19 Hospitalisation in Portugal, the first year: Results from hospital discharge data
Sleep in Frontline Healthcare Workers on Social Media During the COVID-19 Pandemic
Trajectories of child emotional and behavioural difficulties before and during the COVID-19 pandemic in a longitudinal UK cohort
Competitive fitness of emerging SARS-CoV-2 variants is linked to their Distinctiveness relative to preceding lineages from that region
Atypical functional connectivity of the left fusiform gyrus in infants at familial risk for developmental dyslexia
Adverse effects of COVID-19 vaccination: machine learning and statistical approach to identify and classify incidences of morbidity and post-vaccination reactogenicity
An Artificial Intelligence-Assisted Diagnostic Platform for Rapid Near-Patient Hematology
Peripheral optical coherence tomography assisted by scleral depression in retinopathy of prematurity
The association between WASH, nutrition, and early childhood growth faltering in rural Cambodia: a cross-sectional risk factor analysis
Sociodemographic inequality in COVID-19 vaccination coverage amongst elderly adults in England: a national linked data study
Use of portable air cleaners to reduce aerosol transmission on a hospital COVID-19 ward