RT Journal Article SR Electronic T1 What Is Axial Psoriatic Arthritis? JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1611 OP 1613 DO 10.3899/jrheum.180802 VO 45 IS 12 A1 JOY FELD A1 VINOD CHANDRAN A1 DAFNA D. GLADMAN YR 2018 UL http://www.jrheum.org/content/45/12/1611.abstract AB