Declaration of interest
K Okonechnikov, KW Pajtler, M Kool and SM Pfister were supported by Hopp-Children’s Cancer Center at the NCT Heidelberg (KiTZ), Heidelberg, Germany; Division of Pediatric Neurooncology, German Cancer Research Center (DKFZ) and German Cancer Consortium (DKTK), Heidelberg, Germany. SC Mack was supported by the Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed. Peer reviewers on this manuscript have no relevant financial or other relationships to disclose.