1. Department of Family Medicine and Primary Care, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
2. Department of General Practice, The University of Hong Kong-Shenzhen Hospital, Shenzhen, China
3. School of Nursing, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, People’s Republic of China
4. Division of Infectious Diseases, Department of Medicine, University of North Carolina School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC
5. Faculty of Infectious and Tropical Diseases, The London School of Hygiene and Tropical Medicine, London, United Kingdom
6. Melbourne Sexual Health Centre, Alfred Health, Melbourne, Victoria, Australia
7. Central Clinical School, Monash University, Melbourne, Victoria, Australia
8. University College London Centre for Clinical Research in Infection and Sexual Health, Institute for Global Health, London, United Kingdom