%0 Journal Article %A Myrthe A M van Delft %A Diane van der Woude %A René E M Toes %A Leendert A Trouw %T Secretory form of rheumatoid arthritis–associated autoantibodies in serum are mainly of the IgM isotype, suggesting a continuous reactivation of autoantibody responses at mucosal surfaces %D 2019 %R 10.1136/annrheumdis-2018-213724 %J Annals of the Rheumatic Diseases %P 146-148 %V 78 %N 1 %U https://ard.bmj.com/content/annrheumdis/78/1/146.full.pdf