1. From the Department of Behavioral Sciences and Health Education, Rollins School of Public Health, Atlanta, Georgia;
2. Emory/Atlanta Center for AIDS Research, Atlanta, Georgia;
3. Department of Pediatrics, Division of Infectious Diseases, Epidemiology and Immunology, Emory University School of Medicine, Atlanta, Georgia; and
4. Department of Health Behavior, School of Public Health, University of Alabama, Birmingham, Alabama.