Affiliation: | 1. Gastroenterology Department, Coimbra University Hospital, , Coimbra, Portugal;2. Gastroenterology Centre, Faculty of Medicine, Coimbra University, , Coimbra, Portugal;3. Laboratory of Microbiology, Faculty of Pharmacy, Coimbra University, , Coimbra, Portugal;4. Pathology Department, Coimbra University Hospital, , Coimbra, Portugal |