RT Journal Article SR Electronic T1 The Corner Pocket Revisited JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 308 OP 308 DO 10.1097/AAP.0b013e3182168177 VO 36 IS 3 A1 Richard Brull A1 Vincent W.S. Chan YR 2011 UL http://rapm.bmj.com/content/36/3/308.abstract AB