1. Western Human Nutrition Research Center, Agricultural Research Service, U.S. Department of Agriculture, and Department of Nutrition, University of California, Davis, California.
2. Veteran Affairs Northern California Health Care System, Martinez, California.
3. Department of Medicine, School of Medicine, University of California Davis, Sacramento, California.
4. Western Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Albany, California.
5. Veteran Affairs Northern California Health Care System, Sacramento, California.