Affiliation: | 1. Kantonsspital St Gallen, 9007 St Gallen, Switzerland;2. Rheumatology Unit, ASST Fatebenefratelli Sacco, Milan, Italy, Milan, Italy;3. Orthopedic and Trauma Unit, Santissima Trinità Hospital, Cagliari, Italy;4. Division of Rheumatology, University of Pavia, IRCCS Policlinico San Matteo Foundation, Pavia, Italy |