1. CNIO-HNJ Clinical Research Unit; Pediatric Oncology, Hematology and Stem Cell Transplant Department; Hospital Infantil Universitario Niño Jesús; Avenida Menéndez Pelayo, 65 28009 Madrid Spain
2. Pediatric and Adolescent Drug Development, Children and Young People's Unit; The Royal Marsden NHS Foundation Trust; London UK
3. Division of Clinical Studies and Cancer Therapeutics; The Institute of Cancer Research; London UK
4. Instituto de Investigación La Princesa; Madrid Spain