1. Mayo Clinic Arizona, Scottsdale, Arizona, USA
2. Division of Gastroenterology U, San Giovanni AS University-Teaching Hospital, Torino, Italy
3. Gastroenterolgy Unit, Ospedale Valduce, Como, Italy
4. Atlanta Gastroenterology Associates, Atlanta, Georgia, USA
5. Division of Health Sciences Research, Mayo Clinic Arizona, Scottsdale, Arizona, USA
6. Abteilung für Gastroenterologie, Hepatologie und Endokrinologie, Robert-Bosch-Krankenhaus, Stuttgart, Germany
7. Children’s Center for Digestive Health Care, Children’s Healthcare of Atlanta, Atlanta, Georgia, USA
8. Gastroenterology Department, Hospital Senhora da Oliveira, Guimarães, Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal
9. Amsterdam University Medical Center, Amsterdam, the Netherlands
10. Sheba Medical Center, Tel Aviv, Israel
11. The University of Chicago Medicine, Chicago, Illinois, USA