1. Department of General Surgery, Eskişehir Osmangazi University, Medical Faculty, Eskisehir, Turkey
2. Vocational School of Health Services, Eskişehir Osmangazi University, Eskisehir, Turkey
3. Department of Biostatistics, Eskisehir Osmangazi University Medical Faculty, Eskisehir, Turkey
4. Department of General Surgery, Afyon State Hospital, Afyon, Turkey
5. Department of General Surgery, Afyon Kocatepe University Medical Faculty, Afyon, Turkey