RT Journal Article SR Electronic T1 Lumbar Epidural Steroid Injection: Assessment of Needle Placement and Steroid Distribution using Epidurography JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 47 OP 47 DO 10.1136/rapm-00115550-199924031-00047 VO 24 IS Suppl 1 A1 Tae Song A1 James P. Rathmell A1 Gary F. Alsofrom A1 Jeffrey A. Borchardt YR 1999 UL http://rapm.bmj.com/content/24/Suppl_1/47.abstract AB