1. Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC.
2. General Practice and Primary Health Care Academic Centre, University of Melbourne, Melbourne, VIC.
3. Melbourne Sexual Health Centre, Alfred Health, Melbourne, VIC.
4. Kirby Institute, University of New South Wales, Sydney, NSW.
5. Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland.
6. Sydney Sexual Health Centre, Sydney Hospital, Sydney, NSW.