RT Journal Article SR Electronic T1 Unintentional Wrong-Sided Peripheral Nerve Block JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 95 OP 97 DO 10.1136/rapm-00115550-200803000-00001 VO 33 IS 2 A1 Rupp, Stephen M. YR 2008 UL http://rapm.bmj.com/content/33/2/95.abstract AB