1. Centers for Behavioral and Preventive Medicine, The Miriam Hospital, Providence, RI, USA
2. Department of Psychiatry and Human Behavior, The Warren Alpert Medical School of Brown University, Providence, RI, USA
3. Department of Clinical Research, Planned Parenthood of Southern New England, New Haven, CT, USA
4. Center for Interdisciplinary Research on AIDS, Yale University, New Haven, CT, USA
5. Department of Behavioral and Social Science, School of Public Health, Brown University, Providence, RI, USA
6. Center for Alcohol and Addiction Studies, Brown University, Providence, RI, USA