1. University of Chicago Medicine Inflammatory Bowel Disease Center, Chicago, Illinois, USA
2. Digestive Disease Associates, Gainesville, Florida, USA
3. Charité – Universitätsmedizin Berlin, Berlin, Germany
4. Gastroenterology Department/ISADMU, Centro Médico Teknon, Barcelona, Spain
5. St. Mark’s Hospital, London, UK
6. University of British Columbia, Vancouver, British Columbia, Canada
7. Inserm et Université Paris, Paris, France
8. Fondazione Policlinico A. Gemelli IRCCS–Universita’ Cattolica, Rome, Italy
9. The Ohio State University Wexner Medical Center, Columbus, Ohio, USA