1. Dipartimento di Medicina Interna, University of Genoa, Genoa, Italy
2. Laboratory of Autoimmunology, Ospedale Policlinico San Martino, Genoa, Italy
3. Dipartimento di Medicina Sperimentale, University of Genoa, Genoa, Italy
4. Laboratory of Clinical Chemistry, Papa Giovanni Hospital XXIII, Bergamo, Italy
5. Institute for Experimental Immunology, Euroimmun, Lübeck, Germany
6. Laboratory of Clinical Pathology, Civic Hospital, Santorso, Italy
7. Laboratory of Clinical Pathology, San Antonio Hospital, Tolmezzo, Italy