1. Internist, Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, Hacettepe University, Oguzlar Mah. 2. Cadde 17/7 Balgat, 06520 Ankara, Turkey fax 90 312 2130034
2. Internist, Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine Hacettepe University
3. Professor of Gastroenterology, Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, Hacettepe University