1. Blood Transfusion Service, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico; Milan Italy
2. Italian National Blood Center, National Institute of Health; Rome Italy
3. Blood Transfusion Service and Hematology 1; IRCCS San Martino University Hospital; Genoa Italy
4. Blood Transfusion Service and Hematology; IRCCS Policlinico San Matteo; Pavia Italy
5. Blood Transfusion Service and Hematology; Federico II University Hospital; Naples Italy
6. Blood Transfusion Service and Hematology; Umberto I Hospital; Rome Italy
7. Hematology, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico and University of Milan; Milan Italy
8. Blood Transfusion Service and Hematology; University Hospital; Verona Italy
9. Laboratory of Medical Statistics and Biometry, Department of Clinical Sciences and Community Health; University of Milan; Milan Italy