RT Journal Article SR Electronic T1 Epidural Blocks with a 25 Gauge “Modified Tip” Epidural Needle JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 46 OP 46 DO 10.1136/rapm-00115550-199924031-00046 VO 24 IS Suppl 1 A1 J. A. Aldrete YR 1999 UL http://rapm.bmj.com/content/24/Suppl_1/46.abstract AB