1Department of Public Health, University of Otago, P.O. Box 7343, Wellington, New Zealand
2Department of Social and Behavioral Sciences, Harvard School of Public Health, Harvard University, 677 Huntington Avenue, Boston, MA 02115, USA
3Statistics Research Associates Ltd., 8 Bristol Street, Island Bay, Wellington 6023, New Zealand
4Department of Psychology, University of British Columbia, 2569-2136 West Mall, Vancouver, BC, Canada V6T 1Z4
5Center for AIDS Prevention Studies (CAPS), Department of Medicine, University of California San Francisco, 50 Beale Street, Suite 1300, San Francisco, CA 94105, USA
6Department of Community Health and Prevention, Drexel University School of Public Health, The Bellet Building, 1505 Race Street, Philadelphia, PA 19102, USA
Academic Editor: Emilia Lombardi