1. Medical School, Pontifícia Universidade Católica de Campinas , Campinas 13034-685, SP , Brazil
2. Division of Endocrinology, Diabetes, and Metabolism, The Johns Hopkins University School of Medicine , Baltimore 21287, MD , USA
3. Division of Diabetes, Endocrinology, & Metabolic Diseases, National Institute of Diabetes and Digestive and Kidney Disease, National Institutes of Health , Bethesda 20892, MD , USA