Acknowledgements
RECRUITMENT
Yajie Wang and Wei Zhang have contributed equally to this work. We thank all participants for taking part in this study and all the staff in the partnered organizations including Xinghuo LGBT center, Shenzhen; Friends Care Center, Foshan; and Rainbow Center, Dongguan who generously offered their help in the process of recruitment. Bao Dongping, Ming Bowen, Ye Rouxuan, and Zheng Shaowei were the research assistants and had also contributed throughout the study period.