RT Journal Article SR Electronic T1 Retraction JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP e9 OP e9 DO 10.1136/jnnp.74.5.574ret VO 89 IS 12 YR 2018 UL http://jnnp.bmj.com/content/89/12/e9.abstract AB