1. From the National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Phoenix, AZ (PWF, RLH, ITH, WCK, PAT, and ADS); the Pennington Biomedical Research Center, Baton Rouge, LA (ER); the Section on Statistical Genetics, Department of Biostatistics & Clinical Nutrition Research Center, The University of Alabama at Birmingham, Birmingham, AL (DBA)