1. Maternal and Child Health Department, Division of Pediatric Hematology, Oncology and Stem Cell Transplant University of Padova and Istituto di Ricerca Pediatrica Città della Speranza Padua Italy
2. Medical Statistics Unit, School of Medicine and Surgery University of Milano‐Bicocca Monza Italy
3. Department of Pediatrics, S. Orsola‐Malpighi Hospital University of Bologna Bologna Italy
4. Department of Biomedical Science and Human Oncology University of Bari Aldo Moro Bari Italy
5. Pediatric Hematology and Oncology ARNAS Civico Hospital Palermo Italy
6. Department of Pediatric Oncology‐Hematology Meyer Children's Hospital Florence Italy
7. Pediatric Hematology Oncology Unit, University of Milano‐Bicocca, MBBM Foundation, ASST Monza Monza Italy