1. Clinic of Paediatric Hemato‐Oncology Hospital‐University of Padova Padova Italy
2. General Pathology & Cytopathology Unit Department of Medicine‐DIMED University of Padova Padova Italy
3. Paediatric Unit San Bassiano Hospital Bassano del Grappa Italy
4. Institute of Paediatric Research Fondazione Città della Speranza Padova Italy
5. Paediatric Haemato‐Oncology Unit, Hematology Department Hospital of Pescara Pescara Italy
6. Paediatric Hemato‐Oncology Hospital‐University of Verona Verona Italy
7. Paediatric Hematology‐Oncology A.R.N.A. S. Ospedale Civico Palermo Italy
8. Department of Pathology Children's Hospital of Pittsburgh of UPMC Pittsburgh Pennsylvania United States
9. Department of Pathology San Bortolo Hospital Vicenza Italy