1. Clinical Pathology Unit, ASST Fatebenefratelli-Sacco , Milan , Italy
2. UOC Patologia Clinica, Ospedale “Luigi Sacco” , Via GB Grassi 74 , 20157 Milan , Italy
3. Pathology and Laboratory Services, Saskatchewan Health Authority , Saskatoon , SK , Canada
4. Research Centre for Metrological Traceability in Laboratory Medicine (CIRME) , Università degli Studi di Milano , Milan , Italy