1. Molecular Medicine Unit—Department of Medicine, Institute of Biomedical Research of Salamanca (IBSAL) and Institute of Molecular and Cellular Biology of Cancer (IBMCC), University of Salamanca-SACYL-CSIC , Salamanca , Spain
2. Surgery Department, Vithas Arturo Soria Hospital , Madrid , Spain
3. Haematology Department, University Hospital of Salamanca, Institute of Biomedical Research of Salamanca (IBSAL) , Salamanca , Spain
4. Cancer Research Centre—IBMCC (USAL-CSIC) , Salamanca , Spain
5. Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Madrid, Spain
6. Colorectal Unit, Vall d’Hebrón University Hospital , Barcelona , Spain
7. Surgery Department, Fundación Jiménez Díaz University Hospital , Madrid , Spain
8. Surgery Department, Clinic University Hospital , Salamanca , Spain
9. Surgery Department, Infanta Leonor University Hospital , Madrid , Spain
10. Surgery Department, Gregorio Marañon University Hospital , Madrid , Spain
11. Surgery Department, Hospital del Mar , Barcelona , Spain
12. Gastroenterology Department, Clinic University Hospital , Barcelona , Spain
13. Surgery Department, Ramon y Cajal University Hospital , Madrid , Spain
14. Surgery Department, MD Anderson Cancer Center Madrid , Madrid , Spain
15. Surgery Department, Galdakao-Usansolo Hospital , Vizcaya , Spain
16. Surgery Department, San Carlos University Hospital , Madrid , Spain
17. Surgery Department, Alcorcon Foundation Hospital , Madrid , Spain
18. Surgery Department, Villalba University Hospital , Madrid , Spain
19. Surgery Department, 12 de Octubre University Hospital , Madrid , Spain
20. Surgery Department, University Clinic of Navarra-Madrid , Madrid , Spain