1. Department of Medical Oncology, Hospital Virgen del Rocío, Sevilla, Spain
2. Department of Medical Oncology, Hospital Universitario Ramon y Cajal, Madrid, Spain
3. Department of Medical Oncology, Hospital Universitario A Coruña, A Coruña, Spain
4. Department of Medical Oncology, ICO Bellvitge, Hospitalet Llobregat, Barcelona, Spain
5. Department of Medical Oncology, Hospital Universitario Miguel Servet, Zaragoza, Spain
6. Department of Medical Oncology, Hospital General Yague, Burgos, Spain
7. Department of Medical Oncology, Hospital Insular de Gran Canaria, Las Palmas de Gran Canaria, Spain
8. Department of Medical Oncology, Hospital Marqués de Valdecilla, Santander, Spain
9. Department of Medical Oncology, Hospital Universitario Donostia, Donostia-San Sebastián, Spain
10. Department of Medical Oncology, Hospital Universitario Virgen Macarena, Sevilla, Spain
11. Department of Medical Oncology, Hospital Universitario La Princesa, Madrid, Spain
12. Department of Medical Oncology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
13. Department of Medical Oncology, Complejo Asistencial Universitario de León, León, Spain
14. Roche Farma, S.A., Madrid, Spain
15. Department of Medical Oncology, Hospital Universitario La Paz, Madrid, Spain