Affiliation: | 1. Research Laboratory and Academic Division of Clinical Rheumatology, Department of Internal Medicine, University of Genoa, San Martino Polyclinic Hospital, Genoa, Italy;2. Department of Rheumatology, Ghent University Hospital, Ghent, Belgium;3. Department of Internal Medicine, Ghent University, Ghent, Belgium;4. Biostatistics Unit, Department of Public Health, Ghent University, Ghent, Belgium |