1. Department of Gastroenterology & Clinical Medicine; Tallaght University Hospital; Trinity College Dublin; Dublin Ireland
2. Department of Medical, Surgical and Experimental Science; University of Sassari; Sassari Italy
3. Gastroenterology Unit; Hospital Universitario de La Princesa; Instituto de Investigación Sanitaria Princesa (IIS-IP); Universidad Autónoma de Madrid; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD); Madrid Spain