1. Division of Rheumatology, IRCCS Policlinico San Matteo Foundation, Pavia, and Department of Internal Medicine and Therapeutics, University of Pavia, Italy.
2. Division of Rheumatology, IRCCS Policlinico San Matteo Foundation, Pavia, Italy.
3. Division of Rheumatology, IRCCS Policlinico San Matteo Foundation, Pavia, and Department of Internal Medicine and Therapeutics, University of Pavia, Italy. serena.bugatti@unipv.it