RT Journal Article SR Electronic T1 Decreased Expression of Nicotinamide Phosphoribosyltransferase in Patients with Juvenile Idiopathic Arthritis Receiving Methotrexate JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 741 OP 742 DO 10.3899/jrheum.120639 VO 40 IS 5 A1 FOX, EMILY J. A1 LEEDER, J. STEVEN A1 YE, SHUI Q. A1 BECKER, MARA L. YR 2013 UL http://www.jrheum.org/content/40/5/741.abstract AB