1 Hematology Oncology Division, Department of Women's and Children's Health, University of Padova, Padova 35128, Italy. Electronic address: gianni.bisogno@unipd.it.
2 Paediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy.
3 Servicio de Oncología y Hematología Pediatrica, Hospital Universitari Vall d'Hebron, Barcelona, Spain.
4 Clinical Research Unit, Istituto Oncologico, Veneto IOV-IRCCS, Padova, Italy.
5 Institut d'Hématologie et d'Oncologie Pédiatrique, Centre Léon Bérard, Lyon, France.
6 Department of Paediatric Oncology, Children's Hospital for Wales, Heath Park, Cardiff, UK.