1. Center for Interdisciplinary Research on AIDS, Yale University, New Haven, CT, USA
2. Division of Global Public Health, University of California, San Diego, San Diego, CA, USA
3. Center for Health, Intervention, and Prevention, University of Connecticut, Storrs, CT, USA
4. Centre for Addiction and Mental Health, Social and Epidemiological Research Department, Toronto, ON, Canada
5. Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada
6. Department of Psychology, University of Western Ontario, London, ON, Canada
7. Department of Obstetrics and Gynaecology, University of Western Ontario, London, ON, Canada
8. Department of Psychology, University of Connecticut, Storrs, CT, USA