1. Department of Gastroenterology, Şışlı Etfal Training and Research Hospital, Istanbul, Turkey
2. Department of Otorhinolaryngology, Şışlı Etfal Training and Research Hospital, Istanbul, Turkey
3. Department of Gastroenterology, Harran University, Faculty of Medicine, Urfa, Turkey
4. Department of Pathology, Şışlı Etfal Training and Research Hospital, Istanbul, Turkey
5. Department of Internal Medicine, Gastroenterology Division, Istanbul University, Istanbul Medical Faculty, Istanbul, Turkey