1. Rheumatology Unit, San Pietro Fatebenefratelli Hospital, Rome, Italy
2. Department of Medical and Surgical Specialties and Dentistry, University of Campania “Luigi Vanvitelli”, Naples, Italy
3. Neurological Section, San Pietro Fatebenefratelli Hospital, Rome, Italy
4. Rheumatology Unit, University of Messina, Messina, Italy
5. Rheumatology Unit, ASST-Fatebenefratelli-L. Sacco University Hospital, Milan, Italy
6. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy