[1] Govt Catalonia, Dept Hlth, Catalonian Canc Strategy, Avd Gran Via Hosp 199-203, Barcelona 08908, Spain
[2] Univ Barcelona, Dept Clin Sci, Biomed Res Inst Bellvitge IDIBELL, C Feixa Llarga S-N, Barcelona 08907, Spain
[3] Catalonian Hlth Serv CatSalut, Hlth Serv Procurement & Assessment, Travessera Corts 131-159, Barcelona 08028, Spain
[4] Hosp Santa Creu & Sant Pau, Dept Radiat Oncol, C St Quinti 89, Barcelona 08026, Spain
[5] Univ Hosp Bellvitge, Dept Gen & Digest Surg, C Feixa Llarga S-N, Barcelona 08907, Spain
[6] Clin Univ Hosp, Dept Gastroenterol, C Villarroel 170, Barcelona 08036, Spain
[7] Univ Hosp Bellvitge, Dept Pathol, C Feixa Llarga S-N, Barcelona 08907, Spain
[8] Vall dHebron Univ Hosp, VHIO, Dept Med Oncol, Po de la dHebron 119-129, Barcelona 08035, Spain