1 Department of Pediatrics, Goethe-University Frankfurt, Frankfurt, Germany.
2 Frankfurt Cancer Institute, Goethe University Frankfurt, Frankfurt am Main, Germany.
3 German Cancer Consortium (DKTK), Partner Site Frankfurt/Mainz and German Cancer Research Center (DKFZ), Heidelberg, Germany.
4 Princess Maxima Centrum for Pediatric Oncology, Utrecht, The Netherlands.
5 Pediatric Hematology and Oncology, Martin-Luther-University Halle-Wittenberg, Halle, Germany. dirk.heckl@uk-halle.de.
6 Department of Pediatrics, Goethe-University Frankfurt, Frankfurt, Germany. jan-henning.klusmann@kgu.de.
7 Frankfurt Cancer Institute, Goethe University Frankfurt, Frankfurt am Main, Germany. jan-henning.klusmann@kgu.de.
8 German Cancer Consortium (DKTK), Partner Site Frankfurt/Mainz and German Cancer Research Center (DKFZ), Heidelberg, Germany. jan-henning.klusmann@kgu.de.