1. Department of Gastroenterology, Lozano Blesa University Clinic Hospital, 50009 Zaragoza, Spain
2. Aragon Health Research Institute (IIS Aragón), 50009 Zaragoza, Spain
3. Biomedical Research Networking Center in Hepatic and Digestive Diseases (CIBERehd), 28029 Madrid, Spain
4. Medicine Department, University of Zaragoza, 50009 Zaragoza, Spain