1. Department of General Surgery, Medical Faculty, University of Yüzüncü Yıl University,Van, Turkey
2. Department of Biochemistry, Cerrahpasa Medical Faculty, University of Istanbul, Istanbul, Turkey
3. Department of Internal Medicine, Medical Faculty, University of Yüzüncü Yıl University, Van, Turkey
4. Department of Gastroenterology, Medical Faculty, University of Yüzüncü Yıl University, Van, Turkey
5. Department of Biostatistics, Cerrahpasa Medical Faculty, University of Istanbul, Istanbul, Turkey
6. Department of 2nd General Surgery, Haseki Training Hospital, Istanbul, Turkey