1 Italian National Blood Centre, National Institute of Health, Rome, Italy.
2 Italian National Blood Centre, National Institute of Health, Rome, Italy Faculty of Medicine and Psychology "Sapienza" University of Rome, Rome, Italy.
3 National Center for Immunobiologicals Research and Evaluation (CRIVIB), National Institute of Health, Rome, Italy.
4 Blood and Transplant Unit, Italian Ministry of Health, Rome, Italy.