Affiliation: | Endoscopy Unit, Department of Gastroenterology, Institut Clínic de Malalties Digestives I Metabòliques, Barcelona; Hematology Department; Pathology Department; Radiology Department, Hospital Clínic Barcelona, Barcelona; Endoscopy Unit, Department of Gastroenterology, Institut Clínic de Malalties Digestives I Metabòliques, Barcelona, Spain |