1. Department of Medicine, University of Texas Health Science Center, San Antonio, Texas
2. Department of Medicine, University Hospital San Carlos, Red de Centros de Metabolismo y Nutrición (RCMN) (C03/08), Madrid, Spain
3. Center of Studies in Diabetes, Research Center in Public Health, National Institute of Public Health, Mexican Institute of Social Security, American British Cowdray Medical Center, Mexico City, Mexico
4. Research Unit-Clinical Epidemiology, University Hospital La Paz, Red RECAVA, Madrid, Spain