1. Division of Gastroenterology and Hepatology; University Hospital Zurich; Zurich Switzerland
2. Swiss EoE Clinic; Olten Switzerland
3. Division of Gastroenterology and Hepatology; University Hospital Basel; Basel Switzerland
4. Institute of Social and Preventive Medicine; University of Bern; Bern Switzerland
5. Division of Gastroenterology and Hepatology; Mayo Clinic; Rochester MN USA
6. Division of Otorhinolaryngology; Mayo Clinic; Rochester MN USA
7. Viollier AG; Institute for Pathology; Basel Switzerland
8. Division of Gastroenterology and Hepatology; Triemlispital Zurich; Zurich Switzerland
9. Division of Gastroenterology and Hepatology; Lindenhofspital; Bern Switzerland
10. Division of Otorhinolaryngology; Centre Hospitalier Universitaire Vaudois/CHUV; Lausanne Switzerland
11. Division of Gastroenterology and Hepatology; Kantonspital Baden; Baden Switzerland
12. Division of Gastroenterology and Hepatology; Centre Hospitalier Universitaire Vaudois/CHUV; Lausanne Switzerland