1. Medical Faculty, Department of Pediatric Surgery, Ataturk University, Erzurum, Turkey;
2. Medical Faculty, Department of Neurosurgery, Ataturk University, Erzurum, Turkey;
3. Medical Faculty, Department of General Surgery, Ataturk University, Erzurum, Turkey;
4. Medical Faculty, Department of Anesthesiology and Reanimation, Ataturk University, Erzurum, Turkey;
5. Medical Faculty, Department of Pathology, Ataturk University, Erzurum, Turkey