Irfan Soykan1, Arzu Ensari2, Kaan Karayalcin3. 1. Division of Gastroenterology, Ankara University Faculty of Medicine, Ibni Sina Hospital, Ankara, Turkey. 2. Division of Pathology, Ankara University Faculty of Medicine, Ibni Sina Hospital, Ankara, Turkey. 3. Division of Surgery, Ankara University Faculty of Medicine, Ibni Sina Hospital, Ankara, Turkey.