1. Division for Endocrinology and Nephrology, Department of Medicine, University of Leipzig, Leipzig, Germany.
2. Department of Molecular Biology, Faculty of Arts and Sciences, Namik Kemal University, Tekirdag, Turkey.
3. Section of Endocrinology and Metabolism, Dr. Lufti Kirdal Kartal Education and Research Hospital, Istanbul, Turkey.
4. Section of Endocrinology and Metabolism, Department of Internal Medicine, Marmara University Medical School, Istanbul, Turkey.