1. Department of Rheumatology, North Denmark Regional Hospital, Hjoerring, Denmark
2. Center for Clinical Science, Aalborg University, Aalborg, Denmark
3. Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
4. Center for Clinical Research, North Denmark Regional Hospital, Hjoerring, Denmark
5. The DANBIO Registry and Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Centre of Head and Orthopedics, Rigshospitalet, Glostrup, Denmark
6. Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
7. Department of Health Economics and Management, Aalborg University, Aalborg, Denmark