1. Health Sciences University, Gulhane Faculty of Medicine, Department of Endocrinology and Metabolism, Ankara, Turkey
2. Gazi University Faculty of Medicine, Department of Internal Medicine, Division of Geriatrics, Ankara, Turkey
3. Gazi University Faculty of Medicine, Department of Endocrinology and Metabolism, Ankara, Turkey
4. Gazi University Faculty of Medicine, Department of Biochemistry, Ankara, Turkey