1. Department of Gastroenterology, Lozano Blesa University Hospital, 50009 Zaragoza, Spain
2. Aragón Health Research Institute (IIS Aragón), 50009 Zaragoza, Spain
3. School of Medicine, University of Zaragoza, 50009 Zaragoza, Spain
4. CIBER for Liver and Digestive Diseases (CIBERehd), 28029 Madrid, Spain