1. National AIDS Reference Laboratory, National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
2. National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
3. Research Center for Public Health, School of Medicine, Tsinghua University, Beijing, China.
4. Melbourne Sexual Health Centre, Alfred Health, Melbourne, Victoria, Australia.
5. Central Clinical School, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria, Australia.