1. Department of Basic Oncology Hacettepe University Cancer Institute Ankara Turkey
2. Department of Pathology Faculty of Medicine Hacettepe University Ankara Turkey
3. Department of General Surgery Faculty of Medicine Hacettepe University Ankara Turkey
4. Department of Medical and Surgical Research Institute of Health Sciences Hacettepe University Ankara Turkey
5. Department of General Surgery Diskapi Yildirim Beyazit Research and Training Hospital University of Health Sciences Ankara Turkey