1. Rheumatology Department, ASST Fatebenefratelli Luigi Sacco University Hospital, Milan, Italy. vale.gio@fastwebnet.it
2. Rheumatology Department, ASST Fatebenefratelli Luigi Sacco University Hospital, Milan, and Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy.
3. Rheumatology Department, ASST Fatebenefratelli Luigi Sacco University Hospital, Milan, Italy.
4. Rheumatology Unit, ATS Sardegna, P. Dettori Hospital, Tempio Pausania, Italy.
5. Department of Internal Medicine H, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.
6. Rheumatology Clinic, Ospedale Carlo Urbani, Università Politecnica delle Marche, Jesi, Ancona, Italy.