1. Department of Gastroenterology & Hepatology , , Zurich , Switzerland
2. University Hospital Zurich , , Zurich , Switzerland
3. Institute of Social and Preventive Medicine , , Bern , Switzerland
4. University of Bern , , Bern , Switzerland
5. Division of Gastroenterology and Hepatology , , Lausanne , Switzerland
6. Centre Hospitalier Universitaire Vaudois (CHUV) and University of Lausanne , , Lausanne , Switzerland
7. Department of Medicine , Diakonie Hospital Jung- Stilling, Siegen, Germany
8. Alder Hey Children's NHS Foundation Trust and University of Liverpool , Liverpool , UK
9. Department of Gastroenterology and Hepatology, Academic Medical Center , Amsterdam , The Netherlands
10. Division of Gastroenterology , Department of Internal Medicine, , Ann Arbor, MI , USA
11. University of Michigan , Department of Internal Medicine, , Ann Arbor, MI , USA
12. Division of Gastroenterology , , Boston, MA , USA
13. Tufts University School of Medicine , , Boston, MA , USA
14. Division of Allergy and Immunology , Department of Pediatrics, Cincinnati Children's Hospital Medical Center, , Cincinnati, OH , USA
15. University of Cincinnati College of Medicine , Department of Pediatrics, Cincinnati Children's Hospital Medical Center, , Cincinnati, OH , USA
16. Division of Pathology and Laboratory Medicine , , Cincinnati, OH , USA
17. Cincinnati Children's Hospital Medical Center , , Cincinnati, OH , USA
18. Division of Gastroenterology and Hepatology , , Chicago, IL , USA
19. Northwestern University-Feinberg School of Medicine , , Chicago, IL , USA
20. Division of Pediatric Gastroenterology , Hepatology and Nutrition, Riley Hospital for Children, , Indianapolis, IN , USA
21. Indiana University/Community Health Network , Hepatology and Nutrition, Riley Hospital for Children, , Indianapolis, IN , USA
22. Division of Gastroenterology , Mayo Clinic, Rochester, MN , USA
23. Center for Esophageal Diseases and Swallowing , Division of Gastroenterology and Hepatology, , Chapel Hill, NC , USA
24. University of North Carolina School of Medicine , Division of Gastroenterology and Hepatology, , Chapel Hill, NC , USA
25. Digestive Health Institute , Children's Hospital Colorado, Aurora, Colorado and Gastrointestinal Eosinophilic Diseases Program, , Aurora, CO , USA
26. University of Colorado School of Medicine , Children's Hospital Colorado, Aurora, Colorado and Gastrointestinal Eosinophilic Diseases Program, , Aurora, CO , USA