1. Diabetes Molecular Genetics Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Phoenix, Arizona.
2. Department of Biological Sciences, University of Texas at Brownsville, Brownsville, Texas.
3. Department of Diabetes and Endocrinology, ICMDM, Hospital Clínic i Universitari, Barcelona, Spain.