RT Journal Article SR Electronic T1 Levels of evidence for epidural steroid injections. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1635 OP 1635 VO 34 IS 7 A1 Bjordal, Jan M YR 2007 UL http://www.jrheum.org/content/34/7/1635.abstract AB