RT Journal Article SR Electronic T1 Placentation, anencephaly, and spina bifida. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 405 OP 406 DO 10.1136/jmg.15.5.405 VO 15 IS 5 A1 James, W H YR 1978 UL http://jmg.bmj.com/content/15/5/405.abstract AB