1. Office of Science, Center for Tobacco Products, Food and Drug Administration, Silver Spring, Maryland
2. United States Census Bureau, Suitland, Maryland
3. National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
4. Tobacco Control Research Branch, Behavioral Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
5. Information Management Services, Inc
6. Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, Maryland