1. General Surgery Department, Private Minasera Aldan Hospital, 06810 Ankara, Turkey
2. Anesthesiology and Reanimation Department, Atatürk Research and Training Hospital, Ankara, Turkey
3. General Surgery Department, Natomed Private Hospital, Ankara, Turkey
4. General Surgery Department, Fırat University, Elazığ, Turkey
5. General Surgery Department, Medical Park Private Hospital, Ankara, Turkey