PT - JOURNAL ARTICLE ED - , TI - Retraction AID - 10.1136/jnnp.74.5.574ret DP - 2018 Dec 01 TA - Journal of Neurology, Neurosurgery & Psychiatry PG - e9--e9 VI - 89 IP - 12 4099 - http://jnnp.bmj.com/content/89/12/e9.short 4100 - http://jnnp.bmj.com/content/89/12/e9.full SO - J Neurol Neurosurg Psychiatry2018 Dec 01; 89