Affiliation: | 1. Division of Gastroenterology and Hepatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA;2. Digestive Physiology, Hospices Civils de Lyon, Lyon I university and LabTAU Inserm 1032, Lyon, France;3. Gastroenterology and Hepatology Unit, Department of Internal Medicine, Assiut University Hospital, Assiut, Egypt |