1. Department of Laboratory Medicine , Institute of Clinical Pathology, University Hospital of Udine , Udine , Italy
2. Beckman Coulter Srl , Cassina dè Pecchi , Italy
3. Beckman Coulter Eurocenter , Nyon , Switzerland
4. Department of Biomolecular Sciences , Service of Biostatistics, University of Urbino Carlo Bo , Urbino , Italy
5. Department of Medicine (DAME) , University Hospital of Udine , Udine , Italy