1. Methods and Application of Food Composition Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 20705, USA
2. Biochemistry Department, Virginia Tech, Blacksburg, VA 24061, USA
3. Statistics Group, Northeast Area, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 20705, USA
4. Office of Regulatory Science, Center for Food Safety and Applied Nutrition, Food and Drug Administration, U.S. Department of Health and Human Services, College Park, MD 20740, USA
5. Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892, USA