RT Journal Article SR Electronic T1 Head turning sign: pragmatic utility in clinical diagnosis of cognitive impairment JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 852 OP 853 DO 10.1136/jnnp-2011-301804 VO 83 IS 8 A1 Larner, A J YR 2012 UL http://jnnp.bmj.com/content/83/8/852.abstract AB