1. Department of General Surgery, Ege University School of Medicine, Izmir, Turkey
2. Department of General Surgery, Denizli State Hospital, Izmir, Turkey
3. Department of Medical Oncology, Ege University School of Medicine, Izmir, Turkey
4. Department of Pathology, Ege University School of Medicine, Izmir, Turkey
5. Department of Biostatistics, Ege University School of Medicine, Izmir, Turkey