PT - JOURNAL ARTICLE ED - , TI - Retraction AID - 10.1136/jnnp.2011.244574ret DP - 2017 Aug 24 TA - Journal of Neurology, Neurosurgery & Psychiatry PG - jnnp.2011.244574ret 4099 - http://jnnp.bmj.com/content/early/2017/08/31/jnnp.2011.244574ret.short 4100 - http://jnnp.bmj.com/content/early/2017/08/31/jnnp.2011.244574ret.full