1 Catalonian Cancer Strategy, Department of Health, Government of Catalonia, Avenida Gran Via de l'Hospitalet, Barcelona, Spain, Biomedical Research Institute of Bellvitge (IDIBELL), University of Barcelona, Barcelona, Spain.
2 Department of Gastrointestinal Surgery, Institute of Digestive and Metabolic Diseases (ICMDM), Hospital Clinic, IDIBAPS, Biomedical Research Centre (CIBERehd), Esther Koplowitz Centre, University of Barcelona, Carrer Villaroel, Barcelona, Spain.
3 Colorectal Surgery Unit, Department of Surgery, Hospital del Mar (IMIM), Barcelona, Spain.
4 Colorectal Surgery Unit, Vall d'Hebron University Hospital, Pº de la Vall d'Hebron, Barcelona, Spain.
5 Surgery Unit, Hospital de la Santa Creu i Sant Pau, C/de Sant Quintí, Barcelona, Spain.
6 Biomedical Research Institute of Bellvitge (IDIBELL), University of Barcelona, C/Feixa Llarga, s/n, L'Hospitalet de Llobregat, Barcelona, Spain, Colorectal Unit, Department of General and Digestive Surgery, Bellvitge University Hospital, C/Feixa Llarga, s/n, Barcelona, Spain.
7 Catalonian Cancer Strategy, Department of Health, Government of Catalonia, Avenida Gran Via de l'Hospitalet, L'Hospitalet de Llobregat, Barcelona, Spain, Biomedical Research Institute of Bellvitge (IDIBELL), University of Barcelona, C/Feixa Llarga, s/n,, Barcelona, Spain.
8 Statistics Advisory Service, Biomedical Research Institute of Bellvitge (IDIBELL), University of Barcelona, C/Feixa Llarga, s/n, L'Hospitalet de Llobregat, Barcelona, Spain, Basic Clinical Practice Department, University of Barcelona, C/Feixa Llarga, s/n, L'Hospitalet de Llobregat, Barcelona, Spain.
9 Statistics Advisory Service, Biomedical Research Institute of Bellvitge (IDIBELL), University of Barcelona, C/Feixa Llarga, s/n, L'Hospitalet de Llobregat, Barcelona, Spain.
10 General Surgery Unit, Nicola Giannettasio Hospital, Via Ippocrate, Corigliano-Rossano, Italy, La Sapienza University, Roma, Italy.
11 Department of Gastrointestinal Surgery, Institute of Digestive and Metabolic Diseases (ICMDM), Hospital Clinic, IDIBAPS, Biomedical Research Centre (CIBERehd,), Esther Koplowitz Centre, University of Barcelona, Carrer Villaroel, Barcelona, Spain.
12 Health Service Procurement and Assessment, Catalonian Health Service (CatSalut), Travessera de les Corts, Barcelona, Spain.
13 Catalonian Cancer Strategy, Department of Health, Government of Catalonia, Biomedical Research Institute of Bellvitge (IDIBELL), Barcelona, Spain.