Ibrahim Koral Onal1, Erkan Parlak1, Meral Akdogan1, Yusuf Yesil1, Sedef Ozdal Kuran1, Mevlut Kurt1, Selcuk Disibeyaz1, Eda Ozturk1, Bulent Odemis2
1Turkiye Yuksek Ihtisas Teaching and Research Hospital, Department of Gastroenterology, Ankara, Turkey
2Hacettepe University Medical School, Department of Biostatistics, Ankara, Turkey