1. National Institutes of Health; National Institute of Diabetes and Digestive and Kidney Diseases; Diabetes, Endocrine and Obesity Branch; Bethesda MD USA
2. Department of Endocrinology and Metabolism; Ministry of Health; Ankara Numune Research and Training Hospital; Ankara Turkey
3. Department of Endocrinology and Metabolism; Faculty of Medicine; Hitit University; Corum Turkey