[1] Complejo Hosp Univ Albacete, Dept Oncol, Albacete, Spain
[2] Vall dHebron Univ Hosp, Dept Oncol, Inst Oncol, Barcelona, Spain
[3] Corp Parc Tauli, Dept Oncol, Hosp Sabadell, Sabadell, Spain
[4] Univ Hosp del Mar, Dept Oncol, Barcelona, Spain
[5] Hosp Mataro Consorcio Sanitario Maresme, Dept Oncol, Mataro, Spain
[6] Hosp Son Llatzer, Dept Oncol, Palma De Mallorca, Spain
[7] Hosp Gen Ciudad Real, Dept Oncol, Ciudad Real, Spain
[8] Univ Hosp Reina Sofia, Dept Oncol, Cordoba, Spain
[9] Fdn Inst Valenciano Oncol, Dept Oncol, Valencia, Spain
[10] Hosp Univ Virgen del Rocio, Dept Oncol, Seville, Spain
[11] Hosp Abente & Lago, Oncol Dept, La Coruna, Spain
[12] Inst Catala Oncol, Oncol Dept, Barcelona, Spain
[13] Hosp Univ Virgen de la Victoria, Dept Oncol, Malaga, Spain
[14] Hosp Nuestra Senora Sonsoles, Dept Oncol, Avila, Spain
[15] Hosp Miguel Servet, Dept Oncol, Zaragoza, Spain
[16] Hosp Univ Josep Trueta, Dept Oncol, Catalan Inst Oncol ICO, Girona, Spain
[17] Hosp Clin Barcelona, Gastroenterol, Barcelona, Spain
[18] Hosp San Pedro Alcantara, Dept Oncol, Caceres, Spain
[19] Hosp Univ La Princesa, Dept Oncol, Madrid, Spain