1. At the time of the study, Sabrina C. Boyce, Daniel Triplett, Argentina E. Servin, and Jay G. Silverman were affiliated with the Center on Gender Equity and Health, School of Medicine, University of California, San Diego, La Jolla. Kimberly C. Brouwer was with the School of Medicine, University of California, San Diego. Carlos Magis-Rodriguez was with the National Center for the Prevention and Control of HIV/AIDS, Ministry of Health, Mexico City, Mexico.