1. Department of Internal Medicine, Abant Izzet Baysal University Hospital, Bolu, Turkey
2. Department of General Surgery, Abant Izzet Baysal University Hospital, Bolu, Turkey
3. Department of Endocrinology, Abant Izzet Baysal University Hospital, Bolu, Turkey
4. Department of Medical Biochemistry, Abant Izzet Baysal University Hospital, Bolu, Turkey