1. Research Unit Hospital Galdakao‐Usansolo Galdakao Bizkaia Spain
2. Health Services Research on Chronic Patients Network (REDISSEC) Barakaldo Spain
3. Colorectal Unit Hospital Clínico San Carlos Madrid Spain
4. General Surgery Service Hospital Universitario Basurto Bilbao Spain
5. Research Unit Hospital Costa del Sol Málaga Spain
6. Clinical Epidemiology Unit Corporacio Parc Tauli Barcelona Spain
7. UDG Public Health Sevilla Spain
8. Research Unit Hospital Universitario Basurto Bilbao Spain
9. Research Unit Hospital Universitario DonostiaDonostia‐San Sebastian Gipuzkoa Spain
10. Oncology Unit Hospital Galdakao‐Usansolo Galdakao Bizkaia Spain