1. Division of Rheumatology, ASST Pini, Milano, Dept. of Clinical Sciences & Community Health, Universita degli Studi di Milano, Milano, Italy
2. University of Ghent, Department of Rheumatology, Ghent University Hospital, Ghent, Belgium
3. Research Laboratory and Academic Division of Clinical Rheumatology, Department of Internal Medicine, University of Genova, Genova, Italy