1. Istanbul University—Cerrahpasa, Cerrahpasa Medical School, Department of Internal Medicine, Section of Gastroenterology, Istanbul, Turkey
2. Diyarbakir State Hospital, Diyarbakir, Turkey
3. Istanbul University, Istanbul Medical School, Department of Internal Medicine, Section of Gastroenterology, Istanbul, Turkey
4. University of Health Sciences, Kastamonu State Hospital, Kastamonu, Turkey
5. Saint Mary’s Hospital, Waterbury, Connecticut, USA
6. Medicana International Hospital, Istanbul, Turkey
7. Istanbul University, Istanbul Medical School, Department of Pathology, Istanbul, Turkey