1. Division of Epidemiology, The Ohio State University, Columbus, Ohio, USA
2. Division of Population Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
3. Departments of Medicine and of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California, USA
4. Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina, USA
5. Division of Adolescent and School Health, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
6. U.S. Public Health Service Commissioned Corps, Rockville, MD
7. Department of Behavioral Science and Health Education, Saint Louis University College of Public Health and Social Justice, Saint Louis, Missouri, USA