1. SCDU Nephrology and Dialysis, S. Giovanni Bosco Hospital, Center of Research of Immunopathology and Rare Diseases—Coordinating Center of Piemonte and Valle d'Aosta Network for Rare Diseases, Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
2. Reumatologia, Lupus Clinic, Dipartimento di Medicina Interna e Specialità Mediche, Sapienza Università di Roma, Italy
3. Internal Medicine and Nephrology Unit, Department of Life, Health and Environmental Sciences, University of L'Aquila, San Salvatore Hospital, L'Aquila, Italy
4. Unit of Rheumatology and Clinical Immunology, ASST Spedali Civili, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
5. Rheumatology Unit, Department of Medicine, University of Padua, Padua, Italy
6. Internal Medicine, IRCCS San Raffaele Scientific Institute, Milan, Italy
7. Division of Rheumatology, Department of Clinical Sciences and Community Health, Ospedale Gaetano Pini, University of Milan, Milan, Italy
8. Internal Interdisciplinary Medicine Unit, Lupus Clinic, Department of Experimental and Clinical Medicine, University of Firenze, Firenze, Italy
9. Rheumatology Unit, Department of Medicine, Surgery and Neuroscience, Azienda Ospedaliera Universitaria Senese, Siena, Italy
10. Rheumatology Unit, SUGI and Clinical University Department of Medical, Surgery and Health Sciences, University of Trieste, Trieste, Italy
11. Internal Medicine, University of Padua, Padua, Italy
12. Rheumatology, Department of Locomotor System, ASL3, Genova, Italy
13. Rheumatology Unit, Department of Internal Medicine, Azienda USL-IRCCS di Reggio Emilia, Università di Modenae Reggio Emilia, Reggio Emilia, Italy
14. Rheumatology Unit, Department of Medicine, Azienda Sanitaria dell'Alto Adige, Bolzano, Italy
15. Internal Medicine, Ospedale di Lodi, Italy
16. U.O.C. Reumatologia, Ospedale San Camillo-Forlanini, Roma, Italy