RT Journal Article SR Electronic T1 Erratum JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 492 OP 492 DO 10.1016/rapm-00115550-200309000-00030 VO 28 IS 5 YR 2003 UL http://rapm.bmj.com/content/28/5/492.abstract AB