[1] Univ Gregorio Maranon, Hosp Gen, Madrid, Spain
[2] Hosp Univ Vall dHebron, Barcelona, Spain
[3] Hosp Clin Barcelona, Barcelona, Spain
[4] Hosp Univ 12 Octubre, Madrid, Spain
[5] Hosp Germans Trias Pujol, Inst Catala dOncologia ICO, Badalona, Spain
[6] Hosp Univ Girona, Inst Catala Oncol, Girona, Spain
[7] Univ Navarra, Pamplona, Spain
[8] Univ Valencia, Consorci Hosp Gen, Valencia, Spain
[9] Univ Bellvitge, Inst Catala Oncol ICO, Hospitalet Llobregat, Ctr Sanitari, Barcelona, Spain
[10] Hosp HM Univ Sanchinarro CIOCC, Madrid, Spain
[11] Hosp HM Univ Sanchinarro CIOCC, Madrid, Spain
[12] Ramon & Cajal Univ Hosp, Madrid, Spain
[13] Univ Valladolid, Hosp Clinico, Valladolid, Spain
[14] Hosp Univ Lucus Augusti, Lugo, Spain
[15] Hosp Univ Miguel Servet, Zaragoza, Spain
[16] Hosp Univ Fdn Jimenez Diaz, Madrid, Spain
[17] Hosp Univ Alvaro Cunqueiro, Vigo, Spain
[18] Princesa Univ Hosp, Madrid, Spain
[19] Hosp Clin Barcelona ICMHO, Barcelona, Spain
[20] Hosp Germans Trias Pujol, Inst Catala Oncol ICO, Badalona, Spain
[21] Hosp Univ Fdn Jimenez Diaz, IIS FJD, Madrid, Spain