RT Journal Article SR Electronic T1 Inconsistency between Danish incidence and prevalence data about psoriatic arthritis (PsA) JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP e44 OP e44 DO 10.1136/annrheumdis-2017-212817 VO 78 IS 5 A1 Philipp Sewerin A1 Annika Hoyer A1 Matthias Schneider A1 Benedikt Ostendorf A1 Ralph Brinks YR 2019 UL http://ard.bmj.com/content/78/5/e44.abstract AB