1. Division of Gastroenterology and Hepatology Department of Internal Medicine Medical University Graz Austria
2. Centre for Integrative Gastroenterology Digestive Function: Basel Laboratory and Clinic for Motility Disorders and Functional Gastrointestinal Diseases Klinik Arlesheim Arlesheim Switzerland
3. Division of Gastroenterology and Hepatology University Hospital Zurich Zurich Switzerland
4. Department of Internal Medicine Israelitic Hospital Academic Hospital of the University of Hamburg Hamburg Germany
5. Pediatric Department Hospital “F. Del Ponte” University of Insubria Varese Italy
6. Gastroenterology and Endoscopy Unit Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milano Italy
7. Department of Gastroenterology and Hepatology University Hospital of Internal Medicine 3 Medical University of Vienna Vienna Austria
8. UOC Medicina Interna e Gastroenterologia Dipartimento di Scienze Mediche e Chirurgiche Fondazione Policlinico Universitario A. Gemelli IRCCS Rome Italia
9. Department of Medicine and Ageing Sciences “G. d'Annunzio” University of Chieti‐Pescara Chieti Italy
10. Department of Pediatric Gastroenterology, Hepatology and Nutrition Emma Children's Hospital Amsterdam UMC University of Amsterdam Amsterdam The Netherlands
11. UCL Great Ormond Street Institute of Child Health and Department of Gastroenterology Neurogastroenterology and Motility Great Ormond Street Hospital London UK
12. Department of Gastroenterology Clinica Medicala 2 Cluj‐Napoca Romania
13. Department of Paediatric Gastroenterology, Hepatology and Nutrition KidZ Health Castle UZ Brussel Brussels Belgium
14. Department of Gastroenterology Medical Centre Hungarian Defence Forces Budapest Hungary
15. Clinic of Gastroenterology Tsaritsa Yoanna University Hospital Medical University of Sofia Sofia Bulgaria
16. Gastroenterology, Hepatology and Liver Transplant Queensland Children's Hospital Brisbane Australia
17. Clinic for General Medicine, Gastroenterology, and Infectious Diseases Augustinerinnen Hospital Cologne Germany