1. National STD Reference Laboratory, National Center for STD Control, Chinese Academy of Medical Sciences and Peking Union Medical College Institute of Dermatology, Nanjing, China
2. University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
3. Department of STD Epidemiology, National Center for STD Control, Chinese Academy of Medical Sciences and Peking Union Medical College Institute of Dermatology, Nanjing, China
4. Department of STD Control of Guangxi Autonomous Region Institute of Dermatology, Nanjing
5. Family Health International Country Office in China, Beijing, China
6. Division of Clinical Infectious Disease, University of North Carolina Chapel Hill School of Medicine, Chapel Hill, NC, USA