1. Department of Gastroenterology and Hepatology University Hospital Zürich Zürich Switzerland
2. Digestive Function: Basel, Laboratory and Clinic for Motility Disorders and Functional Digestive Diseases Arlesheim Switzerland
3. Center for Esophageal Diseases Division of Gastroenterology University of California San Diego La Jolla CA USA
4. Feinberg School of Medicine Department of Medicine Northwestern University Chicago IL USA
5. Pontificia Universidad Javeriana‐Hospital San Ignacio Bogota Colombia
6. University Hospital University of Chile Santiago Chile
7. University College London Hospital London UK
8. Translational Research in GastroIntestinal Disorders (TARGID University of Leuven Leuven Belgium