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 protocol by Gifty Marley, Rayner Kay Jin Tan, Dan Wu, Tong Wang, Murong Sun, Qilei Sheng, Margaret Elizabeth Holly, Takhona Grace Hlatshwako, Cheng Wang, Weiming Tang, Rohit Ramaswamy, Ligang Yang, Danyang Luo, Sean S. Sylvia, Kurt Gray, David Van Duin, Heping Zheng, Joseph D. Tucker

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