1. Division of Gastroenterology and HepatologyCentre Hospitalier Universitaire Vaudois/CHUV and University of Lausanne (UNIL) Lausanne Switzerland
2. Nestlé Research Center Vevey Switzerland
3. Institute of PathologyUniversity of Bern Bern Switzerland
4. Department of GastoenterologyHospital General de Tomelloso Tomelloso Ciudad Real Spain
5. Division of Gastroenterology, Dipartimento di Fisiopatologia Medico‐Chirurgica e dei TrapiantiUniversità degli Studi of Milan, Fondazione IRCCS Cà Granda – Ospedale Maggiore Policlinico Milan Italy
6. Division of Allergy and Clinical ImmunologyCentre Hospitalier Universitaire Vaudois Lausanne Switzerland
7. Institute of Social and Preventive MedicineUniversity of Bern Bern Switzerland
8. Division of Gastroenterology, Department of SurgeryOncology and Gastroenterology – DiSCOG Azienza Ospedaliera di Padova Padova Italy