[1] Hosp Univ Virgen Rocio, Seville, Spain
[2] PUCRS Sch Med, Porto Alegre, RS, Brazil
[3] HCU Valencia, Valencia, Spain
[4] Inst Nacl Canc Brasil, Rio De Janeiro, Brazil
[5] Hosp Amaral Carvalho, Jau, Brazil
[6] Inst Valenciano Oncol, Valencia, Spain
[7] Ctr Med 20 Novembre Issste, Mexico City, DF, Mexico
[8] Hosp Arnau Vilanova, Lleida, Spain
[9] Inst Nacl Canc, Santiago, Chile
[10] Hosp Clin San Carlos, Madrid, Spain
[11] HCU San Carlos, Madrid, Spain
[12] Inst Nacl Enfermedades Neoplas, Lima, Peru
[13] Hosp Reina Sofia, Cordoba, Spain
[14] Hosp Beneficencia Espanola, San Luis Potosi, Mexico
[15] Hosp Prov Castellon, Castellon de La Plana, Spain
[16] Hosp Puerta Mar, Cadiz, Spain
[17] Clin San Jose, Obregon, Mexico
[18] Hosp Gen Elche, Alicante, Spain
[19] HU Miguel Servet, Zaragoza, Spain
[20] Hosp Univ Gregorio Maranon, Madrid, Spain