1. Division of Nutrition, Physical Activity, and Obesity, Centers for Disease Control and Prevention, Atlanta, Georgia.
2. Division of Heart Disease and Stroke Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia.
3. Office of Dietary Supplements, National Institutes of Health, Bethesda, Maryland.
4. Department of Epidemiology, Emory University, Atlanta, Georgia.
5. Division of Health and Nutrition Examination Surveys, Centers for Disease Control and Prevention, Atlanta, Georgia.
6. Department of Statistics, Iowa State University, Ames, Iowa.
7. National Cancer Institute, National Institutes of Health, Bethesda, Maryland.
8. Division of Laboratory Science, Centers for Disease Control and Prevention, Atlanta, Georgia.