RT Journal Article SR Electronic T1 Finding Nerves Is Not Simple JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 367 OP 371 DO 10.1016/S1098-7339(03)00395-X VO 28 IS 5 A1 Quinn Hogan YR 2003 UL http://rapm.bmj.com/content/28/5/367.abstract AB