1. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
2. Rheumatology Institute of Lucania (Irel) and Rheumatology Department of Lucania, San Carlo Hospital of Potenza, Italy
3. Trauma and Orthopedic Unit, Santissima Trinità Hospital, Cagliari, Italy
4. Department of Rheumatology, ASST Fatebenefratelli-Sacco, Milan, Italy