1. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
2. Policlinic and Hiller Research Unit for Rheumatology, Heinrich Heine University Duesseldorf, Duesseldorf, Germany
3. Rheumatology Unit, Department of Medicine (DIMED), University of Padova, Padova
4. Department of Clinical and Experimental Sciences, Rheumatology and Clinical Immunology Unit, ASST Spedali Civili, Brescia, University of Brescia, Brescia
5. Division of Gynecology and Obstetrics, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
6. Division of Rheumatology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada