1. Department of General Surgery, Bagcilar Training and Research Hospital, University of Health Sciences, Istanbul, Turkey.
2. Department of General Surgery, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, University of Health Sciences, Istanbul, Turkey.
3. Department of General Surgery, Acibadem Taksim Hospital, Istanbul, Turkey.
4. Department of General Surgery, Istanbul Kolan Hospital, Istanbul, Turkey.
5. Department of General Surgery, Istanbul Medical Faculty, University of Istanbul, Istanbul, Turkey.