1. Pediatric Surgery, Department of Women's and Children's Health University Hospital of Padua Padua Italy
2. Hematology Oncology IRCCS Istituto Nazionale dei Tumori Milan Italy
3. Department of Oncohematology Bambino Gesù Children's Hospital, IRCCS Rome Italy
4. Department of Pediatric Surgery Bambino Gesù Children's Hospital, IRCCS Rome Italy
5. Hematology/Oncology Unit A.R.N.A.S. Civico Di Cristina e Benfratelli Palermo Italy
6. Department of Pediatric Onco‐Hematology Regina Margherita Children's Hospital Turin Italy
7. Pediatric Hematology‐Oncology Azienda Ospedaliera Universitaria Integrata Verona Italy
8. Department of Pathology Bambino Gesù Children's Hospital, IRCCS Rome Italy
9. Hematology Oncology, Department of Women's and Children's Health University Hospital of Padua Padua Italy
10. Pediatric Surgery, Department of Emergencies and Organ Transplantation Azienda Ospedaliero‐Universitaria Consorziale Ospedale Pediatrico Giovanni XXIII Bari Italy