[1] Hospital Infantil Virgen del Rocío,Department of Pediatric Oncology
[2] The Hospital for Sick Children,Division of Neuro
[3] Hospital de Pediatría SAMIC Prof. Dr. Juan P. Garrahan,Oncology
[4] King Hussein Cancer Center,Department of Hematology/Oncology
[5] Hospital Sant Joan de Déu,Department of Pediatrics, Hematology/Oncology
[6] Hospital Infantil Virgen del Rocío,Department of Pediatric Oncology
[7] Hospital Universitario Niño Jesús,Department of Pediatric Neurosurgery