1. Ege University Faculty of Medicine, Department of Pediatric Endocrinology, İzmir, Turkey

2. Dokuz Eylül University Faculty of Medicine, Department of Internal Medicine, Division of Endocrinology and Metabolism, İzmir, Turkey

3. University of Michigan Medical School, Department of Medicine, and Brehm Center for Diabetes, Division of Metabolism, Endocrinology, and Diabetes, Michigan, USA