1. Department of Medical Biology and Genetics, Ondokuz Mayis University, Samsun, Turkey.
2. Department of General Surgery, Faculty of Medicine, Ondokuz Mayis University, Samsun, Turkey.
3. Department of Surgery Clinics, Oncology Research Hospital, Ankara, Turkey.
4. Department of Biostatistics, Faculty of Medicine, Ondokuz Mayis University, Samsun, Turkey.