1. Northwestern University, Digestive Health Centre, Chicago, IL, USA
2. University of California San Diego, Division of Gastroenterology, La Jolla, CA, USA
3. Icahn School of Medicine at Mount Sinai, Gastroenterology, New York, NY, USA
4. University Hospital Leuven, Gastroenterology, Leuven, Belgium
5. AbbVie Inc., Global Pharmaceutical Research & Development, North Chicago, IL, USA
6. AbbVie Deutschland GmbH & Co. KG, Ludwigshafen, Germany
7. Medical University of Vienna, Department for Gastroenterology and Hepatology, Vienna, Austria