1. VA Connecticut Healthcare System, West Haven, CT, USA
2. Yale School of Medicine, New Haven, CT, USA
3. Department of Epidemiology, Brown University School of Public Health, Providence, RI, USA
4. Department of Population Health, NYU Grossman School of Medicine, New York, USA
5. Department of Epidemiology, University of Kentucky College of Public Health, Lexington, KY, USA
6. Center on Drug and Alcohol Research, Department of Behavioral Science, University of Kentucky College of Medicine, Lexington, KY, USA
7. Center for Interdisciplinary Research on AIDS, Yale School of Public Health, New Haven, CT, USA