1. Department of General Surgery, School of Medicine, University of Istanbul, Istanbul, Turkey.
2. Department of Thoracic Surgery, School of Medicine, University of Istanbul, Istanbul, Turkey.
3. Department of General Surgery, Vakif Gureba Training Hospital, Istanbul, Turkey.
4. Department of General Surgery, School of Medicine, University of Cerrahpasa, Istanbul, Turkey.
5. Department of General Surgery, Sisli Etfal Training Hospital, Istanbul, Turkey.
6. Department of General Surgery, Kartal Training Hospital, Istanbul, Turkey