1. Department of Rheumatology, Leiden University Medical Center, Leiden, The Netherlands
2. Medicine and Rheumatology Unit, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
3. Department of Physical Therapy, Leiden University Medical Center, Leiden, The Netherlands
4. NVLE, Dutch Patient Organization for Systemic Autoimmune Diseases, Utrecht, The Netherlands
5. Department of Orthopaedics, Rehabilitation and Physical Therapy, Leiden University Medical Center, Leiden, The Netherlands