1. Department of General Surgery, Sivrihisar State Hospital, Eskisehir, Turkey
2. Department of General Surgery, Faculty of Medicine, Osmangazi University, Eskişehir, Turkey
3. Department of Physiology, Faculty of Medicine, Osmangazi University, Eskişehir, Turkey
4. Department of Biostatistics, Faculty of Medicine, Eskisehir Osmangazi University, Eskisehir, Turkey