RT Journal Article SR Electronic T1 EDITOR’S CHOICE JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 191 OP 191 DO 10.1136/jnnp.2009.186544 VO 9 IS 4 A1 Charles Warlow YR 2009 UL http://pn.bmj.com/content/9/4/191.abstract AB