[1] University of Padova,Division of Rheumatology, Department of Clinical and Experimental Medicine
[2] University of Genova,Research Laboratory and Academic Unit of Clinical Rheumatology, Department of Internal Medicine
[3] Hospital S. Maria degli Angeli,Rheumatology and Clinical Immunology
[4] Spedali Civili and University of Brescia,Division of Rheumatology and Immunology
[5] Johns Hopkins University School of Medicine,undefined