1. Department of Gastroenterology Hospital General de Tomelloso Tomelloso Spain
2. Instituto de Investigación Sanitaria La Princesa Madrid Spain
3. Instituto de Investigación Sanitaria de Castilla‐La Mancha (IDISCAM) Tomelloso Spain
4. Laboratory Medicine Department. Hospital Universitario de La Princesa Madrid Spain
5. Department of Gastroenterology Hospital Universitario de La Princesa Madrid Spain
6. Department of Surgery Oncology and Gastroenterology Gastroenterology Unit Azienza Ospedaliera di Padova Padova Italy
7. Department of Gastroenterology Hospital Universitario Central de Asturias Oviedo Spain
8. Diet Microbiota and Health Group. Instituto de Investigación Sanitaria del Principado de Asturias (ISPA) Oviedo Spain
9. Department of Gastroenterology Hospital Universitario Valld’Hebrón, Facultat de Medicina Universitat Autònoma de Barcelona Barcelona Spain
10. Centro de Investigación Biomédica en Red Enfermedades Hepáticas y Digestivas Madrid Spain
11. Department of Gastroenterology Hospital de Viladecans Viladecans Spain
12. Department of Gastroenterology Hospital Universitario de Fuenlabrada Fuenlabrada Spain
13. Personalized Medicine Asthma and Allergy. IRCCS Humanitas Research Hospital Rozzano Italy
14. Department of Gastroenterology Hospital Universitario Miguel Servet Zaragoza Spain
15. Department of Gastroenterology Hospital Universitario Fundación Jiménez Díaz Madrid Spain
16. Department of Medicine and Department of Clinical Medicine. The North Danish Regional Hospital Hjoerring and Aalborg University Aalborg Denmark
17. Endoscopy Unit. IRCCS Humanitas Research Hospital Rozzano Italy
18. Pediatric Gastroenterology Unit. Hospital General de Tomelloso Tomelloso Spain
19. Department of Gastroenterology Hospital Universitario Rio Hortega Valladolid Spain
20. Department of Pediatric Gastroenterology Hospital Universitario Puerta de Hierro Majadahonda Madrid Spain
21. Department of Pediatric Gastroenterology Hospital Universitario Severo Ochoa Leganés Spain
22. Department of Gastroenterology Clínica Universidad de Navarra Pamplona Spain
23. Department of Gastroenterology Parc de Salut Mar Barcelona Spain
24. Department of Gastroenterology Hospital de Mataró Mataró Spain
25. Department of Gastroenterology. Hospital Clínico Universitario San Carlos Instituto de Investigacion Sanitaria San Carlos (IdISSC) Madrid Spain
26. Universidad Complutense Madrid Spain
27. Department of Gastroenterology Hospital Álvaro Cunqueiro Vigo Spain
28. Department of Gastroenterology Hospital Universitario Arnau de Vilanova & Hospital Universitario Santa María Lérida Spain
29. Department of Gastroenterology Centre Hospitalier d'Antibes Juan‐les‐Pins Antibes France
30. Department of Gastroenterology Hospital Universitario Santa Lucía Cartagena Spain
31. Department of Pediatric Gastroenterology Hospital de Granollers Granollers Spain
32. Department of Allergy Complejo Hospitalario de Albacete Albacete Spain
33. Research Unit. Hospital General Mancha‐Centro Alcázar de San Juan Alcázar de San Juan Spain