1. Diskapi Teaching and Research Hospital, Department of Surgery, Ankara, Turkey
2. Ankara University School of Medicine, Department of Biostatistics, Ankara, Turkey
3. Ondokuz Mayıs University School of Medicine, Department of Surgery, Samsun, Turkey
4. Ankara University School of Medicine, Department of Surgery, Ankara, Turkey
5. Adana Numune Teaching and Research Hospital, Department of Surgery, Adana, Turkey
6. Ataturk Teaching and Research Hospital, Department of Surgery, Ankara, Turkey
7. Hacettepe University School of Medicine, Department of Surgery, Ankara, Turkey
8. Recep Tayyip Erdogan University School of Medicine, Department of Surgery, Rize, Turkey
9. Antalya Teaching and Research Hospital, Department of Surgery, Antalya, Turkey
10. Trabzon Numune Teaching and Research Hospital, Department of Surgery, Trabzon, Turkey
11. Yeditepe University School of Medicine, Department of Surgery, Istanbul, Turkey
12. Dokuz Eylül University School of Medicine, Department of Surgery, Izmir, Turkey