1. Digestive System Research Unit University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd); Universitat Autònoma de Barcelona Bellaterra Spain
2. Gastroenterology Department Hospital Clínic de Barcelona Bellaterra Spain
3. Gastroenterology Department Hospital Universitario Puerta de Hierro Madrid Spain
4. Radiology Department University Hospital Vall d'Hebron Barcelona Spain