1. Department of General Surgery, Division of HPB Surgery and Liver Transplantation, Medical Faculty, Istanbul University, Istanbul, Turkey
2. Department of Surgery, Hospital of Tsaritsa Joanna, Clinical Center of Gastroenterology, Medical University, Sofia, Bulgaria
3. Department of Pediatric Surgery, Hamidiye Sisli Etfal Hospital, Health Sciences University, Istanbul, Turkey
4. Department of Anesthesiology, Istanbul University Istanbul Faculty of Medicine, Istanbul, Turkey
5. Department of Biostatistics, Istanbul University Istanbul Faculty of Medicine, Istanbul, Turkey