1. Gastroenterology Department, Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria Princesa (IIS-IP), Universidad Autónoma de Madrid (UAM), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Madrid, Spain
2. Rheumatology Department, Norfolk and Norwich Hospitals NHS Foundation Trust, Norwich, UK
3. Department of Gastroenterology, University Hospital Southampton NHS Foundation Trust, Southampton, UK
4. Biogen Intl. GmbH, Baar, Switzerland
5. Section of Dermatology and Venereology, Department of Medicine, University of Verona, Verona, Italy