1 University of Miami, Miller School of Medicine, Department of Medicine, Division of Endocrinology, Diabetes & Metabolism, Miami, FL, USA. Universidad de Miami, Miller School of Medicine. Correspondencia: Division of Endocrinology, Diabetes & Metabolism. Department of Medicine, University of Miami, Miller School of Medicine, 1450 NW 10th Avenue, suite 3054. Miami, Fl, 33136 2 Universidad Metropolitana, Barranquilla (Colombia). 3 Instituto de Investigaciones, Fundacion Cardiovascular, Bucaramanga (Colombia). 4 Universidad Nacional de Colombia, Endocrinologia y Medicina Nuclear. Vol. 23, N° 2, 2007 ISSN 0120-5552 Resumen