1. U.S. Department of Agriculture, Agricultural Research Service, Phytonutrients Laboratory, Beltsville Human Nutrition Research Cente, Beltsville, MD 20705
2. Biometrical Consulting Service, Beltsville, MD 20705
3. U.S. Department of Agriculture, Agricultural Research Service, South Central Agricultural Research Laboratory, Lane, OK 74555
4. U.S. Department of Agriculture Citrus and Subtropical Products Laboratory, Winter Haven, FL 33881