1. Leeds Gastroenterology Institute; St. James's University Hospital; Leeds UK
2. Department of Gastroenterology; Instituto de Investigación Sanitaria Princesa (IIS-IP); Hospital Universitario de la Princesa; Madrid Spain
3. Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD); Madrid Spain
4. Department of Gastroenterology; Tallaght Hospital/Trinity College Dublin; Dublin Ireland
5. Department of Medicine & Gastroenterology; Medical School; “Laiko” University General Hospital of Athens; University of Athens; Athens Greece