Affiliation: | 1. Department of Gastroenterology, University Hospital of Canary Islands, , La Laguna, Spain;2. Internal Medicine Department, Gastroenterology Unit, Alhossien Hospital, Alazhar University, , Cairo, Egypt;3. Department of Gastroenterology, Centre Hospitalier de l'Université de Montréal, , Montreal, Canada;4. Department of Pathology, Centre Hospitalier de l'Université de Montréal, , Montreal, Canada |