1. Digestive System Research Unit; University Hospital Vall d'Hebron; Barcelona Spain
2. Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd); Barcelona Spain
3. Department of Medicine; Universitat Autònoma de Barcelona; Barcelona Spain
4. Rottapharm Biotech (formerly Rotta Research Laboratorium); Monza Italy
5. Gastroenterology Department; Hospital Universitari Germans Trias i Pujol; Badalona Spain