1. Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
2. Division of Infectious Diseases, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
3. Division of Epidemiology, College of Public Health, The Ohio State University, Columbus, OH, USA
4. Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
5. The University of North Carolina Project in Vietnam, Hanoi, Vietnam
6. Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
7. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
8. Thai Nguyen Center of Preventive Medicine, Thai Nguyen, Vietnam