1. Puerta de Hierro-Majadahonda University Hospital; Madrid Spain
2. Biomedical Sciences Research Institute; Puerta de Hierro-Majadahonda University Hospital; Madrid Spain
3. National Institute of Epidemiology; Carlos III Institute of Health; Madrid Spain
4. La Fe University Hospital; Valencia Spain
5. Gregorio Marañón University Hospital; Madrid Spain
6. Canary Islands University Hospital; Santa Cruz de Tenerife Spain
7. San Joan de Reus University Hospital; Tarragona Spain
8. Virgen de la Victoria University Hospital; Málaga Spain
9. Valencia General Hospital; Valencia Spain
10. Gran Canaria Doctor Negrín University Hospital; Las Palmas de Gran Canaria Spain
11. Pontevedra Hospital Complex; Pontevedra Spain
12. Oncology Institute of Valencia; Valencia Spain
13. General Hospital of Elche; Alicante Spain
14. Nuestra Señora de Candelaria University Hospital; Santa Cruz de Tenerife Spain
15. Lozano Blesa Clinic; Zaragoza Spain
16. Gran Canaria Insular Hospital; Las Palmas de Gran Canaria Spain
17. Virgen de la Macarena University Hospital; Seville Spain
18. Virgen de la Salud University Hospital; Toledo Spain
19. Costa del Sol Hospital; Málaga Spain