Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control, Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control, Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control, Capital Medical University - Clinical and Research Center for Infectious Diseases, Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control, Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control, Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control, Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control, Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control, Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control, Beijing Center for Disease Prevention and Control (CDC) - Institute for HIV/AIDS and STD Prevention and Control and Government of the People's Republic of China - Institute for HIV/AIDS and STD Prevention and Control