Incidence of extra-articular manifestations in ankylosing spondylitis, psoriatic arthritis and undifferentiated spondyloarthritis: results from a national register-based cohort study.
Rheumatology (Oxford). 2021 Jun 18;60(6):2725-2734. doi: 10.1093/rheumatology/keaa692.
Rheumatology (Oxford). 2021.
PMID: 33216939
Free PMC article.