1. Faculty of Medicine, Nursing and Health Sciences; School of Public Health and Preventive Medicine; Monash University; Melbourne Victoria Australia
2. Melbourne Sexual Health Centre; Alfred Health; Melbourne Victoria Australia
3. Faculty of Medicine, Nursing and Health Sciences; Central Clinical School; Monash University; Melbourne Victoria Australia
4. Hunan Provincial Center for Disease Control and Prevention; Hunan China
5. School of Public Health and Management; Chongqing Medical University; Chong Qing China
6. Research Center for Public Health; Tsinghua University; Beijing China
7. Faculty of Arts and Social Science at the University of New South Wales; Center for Social Research in Health; Sydney New South Wales Australia