RT Journal Article SR Electronic T1 Pain Medicine: A Comprehensive Review, 2nd Edition JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 77 OP 78 DO 10.1016/j.rapm.2003.10.014 VO 29 IS 1 A1 David R. Walega YR 2004 UL http://rapm.bmj.com/content/29/1/77.abstract AB