1. Department of Gastroenterology, Lyon Sud Hospital, Hospices Civils de Lyon, University Claude Bernard Lyon 1, 165 Chemin du Grand Revoyet, Pierre-Bénite, France
2. INSERM U1111, CIRI, Lyon, France
3. Department of Gastroenterology, University Hospital of Amiens, Amiens, France
4. Department of Gastroenterology, Lyon Sud Hospital, Hospices Civils de Lyon, University Claude Bernard Lyon 1, Pierre-Bénite, France
5. Department of Radiology, Hospices Civils de Lyon, University Claude Bernard Lyon 1, Lyon, France
6. Department of Gastroenterology, Immunology, University Hospital of Saint-Etienne, Saint-Etienne, France