1. Department of General Surgery, Kecioren Training and Research Hospital, Ankara, Turkey.
2. Department of General Surgery, TOBB University of Economics and Technology (ETU) Hospital, Ankara, Turkey.
3. Department of General Surgery, Etlik Training and Research Hospital, Ankara, Turkey.
4. Department of Gastroenterology, Osmaniye Public Hospital, Osmaniye, Turkey.
5. Department of General Surgery, Ankara University Faculty of Medicine, Ankara, Turkey.