Characteristics of the 11 PrEP trials appraised.

Legend:Registration code: as per the National Institute of Health trials registry.Sponsors: BMGF = Bill and Melinda Gates Foundation; CDC = Centers for Disease Control and Prevention (United States of America); Gilead = Gilead Sciences Incorporation; CONRAD = University of Eastern Virginia's CONtraceptive Research & Development program; FHI = Family Health International; NIH = National Institutes of Health (United States of America); USAID = United States Aid for International Development; UW = University of Washington.Enrolled: number in brackets represent target sample sizes; other numbers are actual sample sizes reported.Population: homo = homosexual; hetero = heterosexual.Countries: USA = United States of America.