4 Guangdong AIDS and HCV Diagnosis and Treatment Quality Control Center, Guangzhou Eighth People's Hospital, Guangzhou Medical University, Guangzhou, China.
5 Department of HIV/AIDS Control and Prevention, Jiangmen Center for Disease Control and Prevention, Jiangmen, China.
6 Department of HIV/AIDS Control and Prevention, Zhuhai Center for Disease Control and Prevention, Zhuhai, China.
7 Department of HIV/AIDS Control and Prevention, Yangjiang Center for Disease Control and Prevention, Yangjiang, China.
8 Department of HIV/AIDS Control and Prevention, Yunfu Center for Disease Control and Prevention, Yunfu, China.
9 Department of HIV/AIDS Control and Prevention, Shantou Center for Disease Control and Prevention, Shantou, China.
10 Department of HIV/AIDS Control and Prevention, Huizhou Center for Disease Control and Prevention, Huizhou, China.
11 Centre for Clinical Research, Epidimiology, Modelling and Evaluation, Institute for Global Health, University College London, London, United Kingdom.