Department of Internal Medicine, Abant Izzet Baysal University Faculty of Medicine, Bolu, Turkey
2.Department of Gastroenterology, Abant Izzet Baysal University Faculty of Medicine, Bolu, Turkey
3.Department of General Surgery, Abant Izzet Baysal University Faculty of Medicine, Bolu, Turkey
4.Department of Gastroenterology, Bolu İzzet Baysal State Hospital, Bolu, Turkey