| Affiliation: | 1. Department of Digestive Diseases, Hospital Universitario Marqués de Valdecilla and Marqués de Valdecilla Research Institute (IDIVAL), Santander, Spain;2. Department of Digestive Diseases, Complejo Hospitalario de La Rioja, Logro?o, Spain;3. Department of Digestive Diseases, Hospital de León, León, Spain;4. Department of Digestive Diseases, Hospital Universitario Central de Asturias, Oviedo, Spain;5. Department of Digestive Diseases, Hospital San Agustín, Avilés‐Asturias, Spain;6. Department of Digestive Diseases, Hospital de Cabue?es, Gijón‐Asturias, Spain;7. Department of Digestive Diseases, Hospital Universitario Río Hortega, Valladolid, Spain;8. Department of Digestive Diseases, Hospital Universitario de Burgos, Burgos, Spain;9. Department of Digestive Diseases, Hospital Clínico Universitario de Valladolid, Valladolid, Spain;10. Department of Digestive Diseases, Hospital Universitario de Salamanca, Salamanca, Spain;11. Department of Digestive Diseases, Complejo Asistencial de Zamora, Zamora, Spain;12. Department of Digestive Diseases, Hospital Comarcal de Laredo, Laredo‐Cantabria, Spain;13. Department of Digestive Diseases, Hospital Comarcal Sierrallana, Torrelavega‐Cantabria, Spain;14. Department of Digestive Diseases, Hospital Río Carrión, Palencia, Spain;15. Department of Digestive Diseases, Hospital álvarez‐Buylla, Mieres‐Asturias, Spain;16. Department of Digestive Diseases, Hospital Valle del Nalón, Langreo‐Asturias, Spain |
