1. Department of Internal Medicine, Section of Endocrinology and Metabolism, Yeditepe University Medical Faculty, Istanbul, Turkey.
2. Department of Internal Medicine, Marmara University Medical Faculty, Istanbul, Turkey.
3. Section of Endocrinology and Metabolism, Marmara University Medical Faculty, Istanbul, Turkey.
4. Division of Endocrinology and Metabolism, Kosuyolu Teaching and Research Hospital, Istanbul, Turkey.
5. Division of Endocrinology and Metabolism, Siyami Ersek Teaching and Research Hospital, Istanbul, Turkey.