1. Vitamin Metabolism Laboratory and Nutritional Epidemiology Program, Jean Mayer U.S. Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston, MA 02111
2. The Framingham Heart Study, Boston University School of Medicine, Framingham, MA 01701
3. Office of Food Labeling, Center for Food Safety and Applied Nutrition, Food and Drug Administration, Washington, DC