RT Journal Article SR Electronic T1 Smiling odontoid JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 706 OP 706 DO 10.1136/jnnp.71.5.706 VO 71 IS 5 A1 STEVENSON, K L A1 WELCH, W C YR 2001 UL http://jnnp.bmj.com/content/71/5/706.abstract AB