1. Department of General Surgery , Istanbul Faculty of Medicine, University of Istanbul, Istanbul, Turkey
2. Department of General Surgery, Memorial Hizmet Hospital, Istanbul, Turkey
3. Department of General Surgery, Faculty of Medicine, Yuzuncuyıl University, Van, Turkey
4. Department of General Surgery, Faculty of Medicine, Maltepe University, Istanbul, Turkey
5. Department of General Surgery, Canakkale Military Hospital, Canakkale, Turkey
6. Department of General Surgery, Faculty of Medicine, Yeditepe University, Canakkale, Turkey