1. Gastroenterology Department Hospital Universitario de Galdakao Biocruces Bizkaia Health Research Institute Deusto University Galdakao Spain
2. Research Unit Hospital Universitario de Galdakao Galdakao Spain
3. Research Network on Chronic Disease (REDISSEC) Network for Research on Chronicity, Primary Care and Health Promotion (RICAPPS) Galdakao Spain
4. Deusto University Galdakao Spain
5. Gastroenterology Department Hospital Universitario Araba Vitoria Spain
6. Gastroenterology Department Hospital Universitario Donostia Donostia Spain
7. Gastroenterology Department Hospital de Mendaro Mendaro Spain
8. Gastroenterology Department Hospital de Urduliz Urduliz Spain
9. Gastroenterology Department Onkologikoa Donostia Spain
10. Gastroenterology Department Hospital de Bidasoa Hondarribia Spain
11. Gastroenterology Department Hospital de Mondragón Mondragón Spain
12. Gastroenterology Department Hospital Universitario de Basurto Bilbao Spain
13. Gastroenterology Department Hospital de Zumárraga Zumárraga Spain
14. Gastroenterology Department Hospital Clínico Universitario de Santiago Santiago de Compostela Spain