RT Journal Article SR Electronic T1 Retraction JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP e3 OP e3 DO 10.1136/jnnp.74.5.0574ret VO 89 IS 8 YR 2018 UL http://jnnp.bmj.com/content/89/8/e3.abstract AB