1. Department of Gastroenterology, Addenbrooke’s Hospital, Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
2. Medical Research Council Clinical Trials Unit, University College London, London, United Kingdom
3. Department of Gastroenterology, Viseu Unit, Tondela-Viseu Hospital Centre, 3504–509 Viseu, Portugal
4. Faculty of Medicine of Saint-Etienne, Immunology Unit University Hospital of Saint-Etienne, CIC INSERM 1408, Saint-Etienne, France
5. Department of Gastroenterology, University Hospital of Sain- Etienne, Saint-Etienne, France