RT Journal Article SR Electronic T1 Human traces JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 253 OP 253 DO 10.1136/practneurol-2016-001431 VO 16 IS 3 A1 D J McLauchlan A1 T A T Hughes YR 2016 UL http://pn.bmj.com/content/16/3/253.abstract AB