1. Rheumatology Unit, Department of Experimental and Internal Medicine, University of Messina, Messina, Italy
2. Department of Biomedical and Clinical Sciences “L. Sacco,” University of Milan, Milan, Italy
3. III Division of Infectious Diseases, ASST Fatebenefratelli Sacco, Luigi Sacco Hospital, Milan, Italy
4. Department of Clinical Neurosciences, Villa S. Benedetto Menni, Albese (Como), Italy
5. Humanitas Clinical and Research Center, Rozzano, Italy
6. Centre for Rheumatic Diseases, King’s College London, London, UK