RT Journal Article SR Electronic T1 Erratum JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 172 OP 172 DO 10.1136/rapm-00115550-198207040-00011 VO 7 IS 4 YR 1982 UL http://rapm.bmj.com/content/7/4/172.abstract AB