RT Journal Article SR Electronic T1 Fibromyalgia as a Contextual Factor Influencing Disease Activity Measurements in Spondyloarthritis and Psoriatic Arthritis JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1953 OP 1955 DO 10.3899/jrheum.161156 VO 43 IS 11 A1 YING YING LEUNG A1 JULIAN THUMBOO YR 2016 UL http://www.jrheum.org/content/43/11/1953.abstract AB