1. USDA, ARS Western Human Nutrition Research Center 430 West Health Sciences Drive, Davis CA 95616 USA
2. Department of Dermatology University of California Davis Medical Center and Shriners Hospital for Children, Northern California 2425 Stockton Boulevard, Sacramento CA 95816 USA
3. USDA, ARS Western Regional Research Center 800 Buchanan St Albany CA 94710 USA
4. Department of Nutrition University of California Davis One Shields Avenue, Davis CA 95616 USA