1 S.H. Ho Research Centre for Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China; Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China; JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China. Electronic address: [email protected].
2 University of North Carolina Chapel Hill Project-China, Guangzhou, China.
3 Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
4 Melbourne Sexual Health Centre, Alfred Health, Melbourne, Australia; Central Clinical School, Monash University, Melbourne, Australia; Clinical Research Department, London School of Hygiene and Tropical Medicine, London, UK.
5 S.H. Ho Research Centre for Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China; Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China.