1. Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology , Moscow , Russian Federation
2. Morozov City Children Hospital , Moscow , Russian Federation
3. St. Petersburg Pediatric Medical University , St. Petersburg , Russian Federation
4. N.N. Petrov Institute of Oncology , St. Petersburg , Russian Federation
5. Division of Oncology, Children’s National Hospital , Washington, DC , USA
6. Brain Tumor Institute , Washington, DC , USA
7. Center for Neuroscience and Behavioral Medicine , Washington, DC , USA