pubmed-article:18176830 | pubmed:affiliation | Endoscopy Unit, Gastroenterology Department, Institut Clínic de Malalties Digestives i Metabòliques, Hospital Clínic, CIBER-ehd, IDIBAPS, University of Barcelona, Villarroel 170, 08036 Barcelona, Spain. mgfernan@clinic.ub.es | lld:pubmed |