1. University of Padova, Department of Medicine-DIMED, Rheumatology Unit, Padova, Italy.
2. Rheumatology Division, Multispecialist Medical Department, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy; Epidemiology Unit, Italian Society for Rheumatology, Milan, Italy.
3. Department of Medicine, Internal Medicine and Rheumatology Unit, Azienda Ospedaliera Universitaria di Parma, Parma, Italy.
4. Rheumatology, Central Hospital of Bolzano, Bolzano, Italy.
5. University of Padova, Department of Medicine-DIMED, Rheumatology Unit, Padova, Italy; UO Medicina Generale, Ospedale Riabilitativo di Alta Specialità - ORAS- Motta di Livenza, Treviso, Italy.
6. University of Padova, Department of Medicine-DIMED, Rheumatology Unit, Padova, Italy; Internal Medicine Unit, Department of Medicine, San Bortolo Hospital of Vicenza, Vicenza, Italy.
7. University of Padova, Department of Medicine-DIMED, Rheumatology Unit, Padova, Italy; Internal Medicine 1, Ca' Foncello Hospital, ULSS2 Marca Trevigiana, Treviso, Italy.
8. SC Reumatologia, AOU Città della Salute e della Scienza, Torino, Italy.
9. Rheumatology Unit, Department of Medical Sciences, University of Ferrara and Azienda Ospedaliero-Universitaria S. Anna, Cona, Ferrara, Italy.
10. Lupus Clinic, Dipartimento di Scienze Cliniche Internistiche, Anestesiologiche e Cardiovascolari, Sapienza University of Rome, Rome, Italy.
11. Epidemiology Unit, Italian Society for Rheumatology, Milan, Italy; Department of Statistics and Quantitative Methods, Division of Biostatistics, Epidemiology and Public Health, University of Milano-Bicocca, Milan, Italy.
12. Epidemiology Unit, Italian Society for Rheumatology, Milan, Italy.
13. Rheumatology Unit, Department of Medical Sciences, University of Ferrara and Azienda Ospedaliero-Universitaria S. Anna, Cona, Ferrara, Italy; Epidemiology Unit, Italian Society for Rheumatology, Milan, Italy.
14. University of Padova, Department of Medicine-DIMED, Rheumatology Unit, Padova, Italy. roberta.ramonda@unipd.it