[1] Hosp Univ Quironsalud Madrid, Madrid, Spain
[2] Univ Europea, Madrid, Spain
[3] Hosp Univ Fuenlabrada, Madrid, Spain
[4] Hosp Badalona Germans Trias & Pujol, Inst Catalan Oncol, Barcelona, Spain
[5] Complexo Hosp Univ Santiago de Compostela, Santiago De Compostela, Coruna, Spain
[6] Hosp Univ Ramon y Cajal, Madrid, Spain
[7] Hosp Clin Univ Lozano Blesa, Zaragoza, Spain
[8] Hosp Univ Rey Juan Carlos, Madrid, Spain
[9] Univ Hosp Virgen del Rocio, Dept Radiat Oncol, Seville, Spain
[10] Hosp Puerta del Mar, Cadiz, Spain
[11] Hosp Univ St Joan de Reus, Reus, Spain
[12] Hosp Univ Clin San Carlos, Madrid, Spain
[13] Hosp Miguel Servet, Zaragoza, Spain
[14] Inst Valenciano Oncol, Valencia, Spain
[15] Hosp Cent Def Gomez Ulla, Madrid, Spain
[16] Univ Pompeu Fabra, Grp Recerca Oncol Radioterap GREOR, Hosp Esperanza, Parc Salut Mar, Barcelona, Spain