1. Medicine and Rheumatology Unit, IRCCS Istituto Ortopedico Rizzoli , Bologna, Italy
2. Alma Mater Studiorum – Università di Bologna, DIBINEM , Bologna, Italy
3. Department of Rheumatology, Leiden University Medical Center , Leiden, The Netherlands
4. Department of Medicine – Thrombosis and Hemostasis, Leiden University Medical Center , Leiden, The Netherlands
5. Department of Clinical Epidemiology, Leiden University Medical Center , Leiden, The Netherlands