1. a Australian Centre for International and Tropical Health, School of Population Health , The University of Queensland , Brisbane , Australia
2. b Sexual Health and Disease Control Branch, National Department of Health , Port Moresby , Papua New Guinea
3. c HIV/AIDS Prevention and Control in Rural Development Enclaves Project, Department of Health , Port Moresby , Papua New Guinea
4. d 9 Mile Clinic , Hope Worldwide, Port Moresby , Papua New Guinea
5. e Papua New Guinea Institute of Medical Research (PNG IMR) , Eastern Highlands Province (EHP), Goroka , Papua New Guinea
6. f International HIV Research Group, School of Public Health and Community Medicine , The University of New South Wales , Sydney , Australia
7. g National Centre in HIV Epidemiology and Clinical Research , The University of New South Wales , Sydney , Australia