1. Department of Clinical Neurosciences, Hermanas Hospitalarias, Villa San Benedetto Menni Hospital, Como, and Humanitas Clinical and Research Centre, Milan, Italy.
2. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Messina, Italy.
3. Trauma and Orthopaedic Unit, Santissima Trinità Hospital, Cagliari, Italy.
4. Rheumatology Unit, Internal Medicine Department, ASST Fatebenefratelli-Sacco, Milan, and University School of Medicine, Milan, Italy.
5. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Messina, Italy. atzenifabiola@hotmail.com