1 Department of Child and Maternal Health, Clinic of Pediatric Hematology/Oncology, Azienda Ospedaliera-Università di Padova, 35129 Padova, Italy.
2 Department of Pediatric Oncology/Hematology, Hospital Universitario General Gregorio Marañón, Facultad de Medicina, Universidad Complutense Madrid, 28007 Madrid, Spain; elena.cela@salud.madrid.org.
3 Laboratoire d'Excellence GR-Ex, UMR_S1134, Inserm, Université Paris Diderot, Sorbonne Paris Cité, Institut National de la Transfusion Sanguine, 75015 Paris, France; jacques.elion@inserm.fr.
4 Department of Pediatric Hematology and Oncology, Gemeinschaftsklinikum Mittelrhein gGmbH, 56073 Koblenz, Germany; Stephan.Lobitz@gk.de.