1. Kirikkale University, Faculty of Medicine, Department of Gastroenterology, Kirikkale, Turkey
2. Ministry of Health, Yildirim Beyazit Education and Research Hospital, Department of Microbiology, Diskapi, Ankara, Turkey
3. Suleyman Demirel University, Faculty of Medicine, Department of Gastroenterology, Isparta, Turkey
4. Gazi University, Faculty of Medicine, Department of Gastroenterology, Ankara, Turkey
5. Kirikkale University, Faculty of Medicine, Department of Internal Medicine, Kirikkale, Turkey