1. Department of Internal Medicine, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
2. Division of Endocrinology and Metabolism, Department of Internal Medicine, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
3. Department of Biochemistry, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
4. Department of Pathology, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
5. Department of Biostatistics, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey