Fig.2From: Pay-it-forward gonorrhea and chlamydia testing among men who have sex with men and male STD patients in China: the PIONEER pragmatic, cluster randomized controlled trial protocolPragmatic Cluster RCT design flowchart. The figure shows the process of study sites distribution, participant enrollment and participant randomization for the cluster RCT. Each city will have one MSM-led clinic and one public clinic participatingBack to article page