1. Department of General Surgery, Ankara Atatürk Training and Research Hospital, Ankara, Turkey
2. Department of General Surgery, Gemerek State Hospital, Sivas, Turkey
3. Department of General Surgery, Ankara Training and Research Hospital, Ankara, Turkey
4. Department of General Surgery, Güven Hospital, Ankara, Turkey
5. Department of Pathology, Ankara Atatürk Training and Research Hospital, Ankara, Turkey
6. Department of Biochemistry, Etimesgut Public Health Laboratory, Ankara, Turkey