HIV incidence and cohort retention among men who have sex with men in Hangzhou, China: A prospective cohort study

AbstractProspective cohort studies have been conducted to estimate HIV incidence among men who have sex with men (MSM) in first-line megacities cities (>10 million residents) in China, but few in the second-line large- or middle-size cities. This study was to investigate HIV incidence and cohort ret