RT Journal Article SR Electronic T1 Defining Low Disease Activity States in Psoriatic Arthritis Using Novel Composite Disease Instruments JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1765 OP 1766 DO 10.3899/jrheum.160386 VO 43 IS 9 A1 ENNIO LUBRANO A1 FABIO MASSIMO PERROTTA YR 2016 UL http://www.jrheum.org/content/43/9/1765.abstract AB