RT Journal Article SR Electronic T1 The Up-Down Methodology and Practical Peripheral Nerve Blockade JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 480-481 OP 480-481 DO 10.1097/AAP.0b013e3181f02b46 VO 35 IS 5 A1 Steven L. Orebaugh A1 Brian A. Williams A1 Paul E. Bigeleisen YR 2010 UL http://rapm.bmj.com/content/35/5/480-481.abstract AB