RT Journal Article SR Electronic T1 Occipitocervical malformation with atlas duplication JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 1101 OP 1102 DO 10.1136/jnnp-2011-300200 VO 82 IS 10 A1 Fon-Yih Tsuang A1 Jo-Yu Chen A1 Yao-Hong Wang A1 Dar-Ming Lai YR 2011 UL http://jnnp.bmj.com/content/82/10/1101.abstract AB