RT Journal Article SR Electronic T1 Abnormal atlantooccipital measurements. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 990 OP 990 VO 15 IS 5 A1 Kaufman, R A YR 1994 UL http://www.ajnr.org/content/15/5/990.abstract AB