1. Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
2. Centre for Global Public Health, University of Manitoba, Winnipeg, Canada
3. Canada-Pakistan HIV/AIDS Surveillance Project, Centre for Global Public Health, Islamabad, Pakistan
4. National HIV and Retrovirology Laboratories, JC Wilt Infectious Diseases Research Centre, Public Health Agency of Canada, Winnipeg, Canada
5. Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Canada
6. Centre for Communicable Diseases and Infection Control, Public Health Agency of Canada, Ottawa, Canada