Fan Yang, Tiange P Zhang, Weiming Tang, Jason J Ong, Marcus Alexander, Laura Forastiere, Navin Kumar, Katherine T Li, Fei Zou, and Ligang Yang. 2020. “Pay-It-Forward Gonorrhoea and Chlamydia Testing Among Men Who Have Sex with Men in China: A Randomised Controlled Trial.” The Lancet Infectious Diseases. Elsevier, 8, 20: 976-982.