Department of Gastrointestinal Surgery, Türkiye Yüksek İhtisas Hospital, Ankara
2.Departments of General Surgery and Pathology, Atatürk Teaching and Research Hospital, Ankara
3.Department of General Surgery 3, Ankara Atatürk Research and Education Hospital, Ankara
4.1st General Surgery Clinic, Ankara Atatürk Education and Training Hospital, Ankara