1. Rheumatology Unit, Department of Medical and Surgical Science, University of Modena, Azienda Policlinico of Modena, Modena, Italy;
2. Infectious Diseases Unit, University of Milano, Luigi Sacco Hospital, Milan, Italy;
3. Rheumatology Unit, L. Sacco University Hospital, Milan, Italy;
4. Department of Medical and Biological Sciences, Rheumatology Clinic, University of Udine, Udine, Italy;
5. Epidemiology Unit, Italian Society for Rheumatology (SIR), Milan, Italy;
6. Infectious Diseases and Viral Hepatitis Unit, Department of Internal and Specialistic Medicine, Second University of Naples, Naples, Italy;
7. Department of Medicine - Rheumatology Unit, Medical School, University of Bari, Bari, Italy;
8. Infectious Disease Unit, Belcolle Hospital, Viterbo, Italy;
9. Unit of Emerging and Immunosuppressed Infectious Diseases, Department of Gastroenterology and Transplantation, Azienda Ospedaliero-Universitaria “Ospedali Riuniti”, Torrette Ancona, Italy;
10. Rheumatology Department of Lucania, San Carlo Hospital of Potenza and Madonna delle Grazie Hospital of Matera, Potenza, Italy;
11. Division of Rheumatology, Department of Clinical Sciences and Community Health, Gaetano Pini Orthopedic Institute, University of Milan, Milan, Italy;
12. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy;
13. Department of Rheumatology, Università Politecnica delle Marche, Ospedale “C. Urbani”, Jesi Ancona, Italy;
14. Rheumatology Unit, University Clinic and AOU of Cagliari, Cagliari, Italy;
15. Infectious Diseases Unit, Department Public Health and Infectious Disease, “Sapienza” University of Rome, Rome, Italy;
16. Department of Mental Health and Public Medicine, Second University of Naples, Naples, Italy;
17. Clinic of Infectious Diseases, University of Foggia, Foggia, Italy;
18. Department of Infectious Diseases, San Raffaele Scientific Institute, Università Vita-Salute, Milan, Italy;
19. Department of Infectious Diseases, AO Niguarda Ca' Granda, Milano, Italy;
20. Clinical Infectious Diseases, Tor Vergata University, Rome, Italy;
21. Rheumatology and Clinical Immunology Unit, Spedali Civili of Brescia, Brescia, Italy;
22. Rheumatology Unit, A.O. Ospedale Niguarda Cà Granda, Milan, Italy;
23. Department of Internal Medicine and Medical Specialties-Rheumatology Unit, Sapienza University of Rome, Rome, Italy;
24. Third Department of Infectious Diseases- D. Cotugno Hospital- AORN dei Colli, Naple, Italy;
25. Rheumatology Unit, Department of Medical Sciences, University of Ferrara and Sant'Anna University Hospital, Ferrara, Italy;
26. Chair of Hygiene, University of Milan, Milan, Italy