1. State Key Laboratory of Infectious Disease Prevention and Control, National Center for AIDS/STD Control and Prevention, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China.
2. Clinical and Research Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, People's Republic of China.
3. Clinical Center for HIV/AIDS, Capital Medical University Beijing, People's Republic of China.
4. Sichuan Center for Disease Control and Prevention, Chengdu, People's Republic of China.