1. Research Laboratory and Academic Division of Clinical Rheumatology, Department of Internal Medicine (Di.M.I.), Polyclinic Hospital San Martino, University of Genova, Genova, Italy
2. Centro di Ricerca su Osteoporosi e Patologie Osteoarticolari CROPO, Di.M.I., University of Genova, Genova, Italy
3. Department of Rheumatology, Ghent University Hospital, Ghent, Belgium
4. Department of Internal Medicine, Ghent University, Ghent, Belgium