Department of Internal Medicine, Division of Gastroenterology, Hacettepe University School of Medicine, Ankara, Turkey
2.Division of Gastroenterology, Keçiören Training and Research Hospital, Ankara, Turkey
3.Division of Gastroenterology, Yüksek İhtisas Training and Research Hospital, Ankara, Turkey
4.Department of Radiology, Hacettepe University School of Medicine, Ankara, Turkey
5.Division of Gastroenterology, Ankara, Turkey *