1. Department of General Surgery, University of Health Sciences, Dışkapı Yıldırım Beyazıt Research and Training Hospital, Ankara, Turkey
2. Department of General Surgery, Ankara University School of Medicine, Ankara, Turkey
3. Department of General Surgery, Bilkent City Research and Training Hospital, University of Health Sciences, Ankara, Turkey
4. Department of Psychiatry, Division of Consultation-Liaison Psychiatry, Ankara University School of Medicine, Ankara, Turkey
5. Department of Psychiatry, Ege University School of Medicine, İzmir, Turkey
6. Department of Biostatistics, Ankara University School of Medicine, Ankara, Turkey