1. Vatche and Tamar Manoukian Division of Digestive Diseases, UCLA School of Medicine, Los Angeles, California, USA
2. University of Central Lancashire, Preston, United Kingdom
3. Section of Gastroenterology, Hepatology & Nutrition, Rush University Medical Center, Chicago, Illinois, USA
4. Center for Crohn’s and Colitis, Division of Gastroenterology, Hepatology & Endoscopy, Brigham and Women’s Hospital, Boston, Massachusetts, USA
5. Division of Gastroenterology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA