1. Maurizio Benucci, Rheumatology Unit, San Giovanni Di Dio Hospital, Florence, Italy
2. Rheumatology Unit, Department of Internal Medicine, ASST-Fatebenefratelli L. Sacco University Hospital, Milan, Italy
3. Department of Internal Medicine, ASST Rhodense, Milan, Italy
4. Orthopedic and Trauma Unit, Santissima Trinità Hospital, Cagliari, Italy