1. Department of Nutritional Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802;
2. Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808;
3. Lothian, Maryland 20711;
4. Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota 55455;
5. Department of Nutrition, University of California, Davis, California 95616;
6. Department of Dairy and Animal Science, The Pennsylvania State University, University Park, Pennsylvania 16802;