RT Journal Article SR Electronic T1 Both Etanercept and Infliximab Can Elevate Tumor Necrosis Factor (TNF)-α and Be the Cause of Treatment Related New Onset Disease: the Need to Measure Circulating TNF-α JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1679 OP 1679 VO 35 IS 8 A1 RICHARD E. KAST A1 ERIC L. ALTSCHULER YR 2008 UL http://www.jrheum.org/content/35/8/1679.1.abstract AB