[1] Cruces Univ Hosp, Hosp Univ Cruces, Radiat Oncol, Baracaldo, Spain
[2] Univ Basque Country, Med Fac, Barakado, Spain
[3] Hosp Barcelona, Inst Catalan Oncol, Radiat Oncol, Barcelona, Spain
[4] Hosp Castellon, Radiat Oncol, Castellon de La Plana, Spain
[5] Hosp Meixoeiro, Radiat Oncol, Vigo, Spain
[6] Hosp Univ Cruces, Radiat Oncol, Baracaldo, Spain
[7] Hosp Txagorritxu, Radiat Oncol, Vitoria, Spain
[8] Hosp Virgen Rocio, Radiat Oncol, Seville, Spain
[9] Hosp Virgen Macarena, Radiat Oncol, Seville, Spain
[10] Hosp Sanchinarro, Radiat Oncol, Madrid, Spain
[11] Cruces Univ Hosp, Clin Epidemiol Unit, Baracaldo, Spain