1. Blood Systems Research Institute
2. Department of Laboratory Medicine; University of California-San Francisco
3. Department of Medicine; University of California-San Francisco; San Francisco California
4. Italian National Blood Center; Rome Italy
5. Laboratory of Medical Statistics and Biometry, Department of Clinical Sciences and Community Health; University of Milan
6. Department of Regenerative Medicine; Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico; Milan Italy