1. National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia
2. National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
3. National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland
4. IHRC, Atlanta, Georgia
5. National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia
6. National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
7. Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins School of Medicine, Baltimore, Maryland
8. Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland