1. Department of Internal Medicine, Medical Faculty, Yuzuncu Yil University, Van, Turkey
2. Department of Endocrinology and Metabolism, Medical Faculty, Yuzuncu Yil University, Van, Turkey
3. Department of Chemistry, Division of Biochemistry, Faculty of Science, Yuzuncu Yil University, Van, Turkey
4. Department of Endocrinology and Metabolism, Medical Faculty, Medipol University, Istanbul, Turkey