1 Department of Neuro-Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
2 Department of Neurosurgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
3 Department of Pediatrics, University Clinic of Navarra, Pamplona, Spain; Program of Solid Tumors, Center for the Applied Medical Research, Pamplona, Spain; Institute for the Medical Research of Navarra, Pamplona, Spain. Electronic address: mmalonso@unav.es.