1. University of Health Science, Ankara Abdurrahman Yurtaslan Oncology Training and Research Hospital
2. Ankara University School of Medicine Department of Surgical Oncology
3. Diyarbakır Gazi Yaşargil Research Hospital Surgical Oncology Clinic
4. Ankara University School of Medicine, Department of Surgical Oncology
5. Bursa State Hospital Surgical Oncology Clinic
6. Ankara University School of Medicine Department of Biostatistics