1. Department of General Surgery, Faculty of Medicine, Osmangazi University, Eskişehir, Turkey
2. Department of Radiology, Faculty of Medicine, Osmangazi University, Eskişehir, Turkey
3. Department of General Surgery, Yunus Emre State Hospital, Eskişehir, Turkey
4. Department of Radiation Oncology, Faculty of Medicine, Osmangazi University, Eskişehir, Turkey
5. Department of Biostatistics, Faculty of Medicine, Eskisehir Osmangazi University, Eskişehir, Turkey.