1. Clinical Pathology Laboratory Unit; Giannina Gaslini Institute; Genoa Italy
2. Data Management and Biostatistics Unit; Medi Service; Genoa Italy
3. Department of Pediatric Hematology-Oncology; University of Padova; Padova Italy
4. Department of Pediatric Hematology-Oncology; University of Catania; Catania Italy
5. Department of Hematology-Oncology; Giannina Gaslini Institute; Genoa Italy