1. Endoscopy Unit, Institut Clínic de Malalties Digestives i Metabòliques (ICMDM) Hospital Clínic, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Universitat de Barcelona, Barcelona, Spain
2. Department of Medicine, Division of Digestive and Liver Diseases, New York-Presbyterian Hospital/Columbia University Irving Medical Center, New York, New York, USA