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.