1 Department of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China; Kirby Institute, The University of New South Wales, Sydney, NSW 2052, Australia.
2 Melbourne Sexual Health Centre, Alfred Health, Melbourne, VIC 3053, Australia; Central Clinical School, Monash University, Melbourne, VIC 3004, Australia; School of Public Health and Preventive Medicine, Faculty of Medicine, Monash University, Melbourne, VIC 3004, Australia; Research Centre for Public Health, Tsinghua University, Beijing 100084, China.
3 Melbourne Sexual Health Centre, Alfred Health, Melbourne, VIC 3053, Australia; Central Clinical School, Monash University, Melbourne, VIC 3004, Australia.
4 University of North Carolina Project-China, Guangzhou 510085, China.
5 JC School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong; Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen 518057, China.