[1] Service of Medical Oncology, Hospital Universitario San Carlos, Madrid
[2] Service of Medical Oncology, Hospital Universitari Germans Trias i Pujol. Badalona, Barcelona
[3] Service of Medical Oncology, Hospital Miguel Servet, Zaragoza
[4] Service of Medical Oncology, Hospital Reina Sofía, Córdoba
[5] Service of Medical Oncology, Hospital General Carlos Haya, Málaga
[6] Service of Medical Oncology, Hospital General Universitario de Elche, Elche. Alicante
[7] Service of Medical Oncology, Hospital Clínico Universitario, Valencia
[8] Service of Medical Oncology, Ciudad Sanitaria la Paz, Madrid
[9] Service of Medical Oncology, Hospital General Universitario Gregorio Marañón, Madrid
[10] Laboratory of Biotechnology and Pharmacogenomics, Clínica Universitaria de Navarra, Pamplona
[11] Service of Medical Oncology, Hospital Universitario, Madrid
[12] Service of Medical Oncology, Institut Català D'Oncologia (ICO), L'Hospitalet de Llobregat, Barcelona
[13] Service of Medical Oncology, Hospital Universitario Marqués de Valdecilla, Santander
[14] Service of Medical Oncology, Hospital General Vall D'Hebron, Barcelona