[1] Hosp Univ & Politecn La Fe, Valencia, Spain
[2] Hosp Univ Ramon y Cajal, Madrid, Spain
[3] Consorcio Hosp Prov Castellon, Castellon de La Plana, Spain
[4] Miguel Servet Univ Hosp, Zaragoza, Spain
[5] Hosp Miguel Servet, Zaragoza, Spain
[6] Univ Hosp HM Sanchinarro Puerta del Sur, Madrid, Spain
[7] Cruces Univ Hosp, Baracaldo, Spain
[8] Complejo Hosp Navarra, Pamplona, Spain
[9] Hosp Meixoeiro, Vigo, Spain
[10] Hosp Univ Rey Juan Carlos, Madrid, Spain
[11] Hosp Clin Salamanca, Salamanca, Spain
[12] Hosp Gen Valencia, Valencia, Spain
[13] Hosp Cent Def Gomez Ulla, Madrid, Spain
[14] Catalan Inst Oncol, Dept Radiat Oncol, Lhospitalet Barcelona, Spain
[15] Hosp Univ Virgen de la Arrixaca, Murcia, Spain
[16] Hosp Univ La Princesa, Madrid, Spain
[17] Hosp Univ Marques de Valdecilla, Santander, Spain
[18] Hosp Ruber, Madrid, Spain
[19] Hosp Prov Castellon, Castellon de La Plana, Spain