1. Institute of Neuroradiology FrankfurtGermany
2. Department of Radiation Oncology Hospital for Children and Adolescents Johann Wolfgang Goethe‐University Frankfurt Germany
3. Department of Radiation Oncology University Hospital Zurich Zürich Switzerland
4. Division for Pediatric Hematology and Oncology Hospital for Children and Adolescents Johann Wolfgang Goethe‐University Frankfurt Germany