1. Radiology Department; University Hospital Vall d'Hebron; Barcelona; Spain
2. Digestive System Research Unit; University Hospital Vall d'Hebron; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd); Barcelona; Spain
3. Department of Computer Languages and System; Universidad Politécnica de Cataluña; Barcelona; Spain