RT Journal Article SR Electronic T1 Evidence against a female specific class of neural tube defect. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 78 OP 79 DO 10.1136/jmg.20.1.78 VO 20 IS 1 A1 Fraser, F C A1 Maldoff, S R A1 Lippman-Hand, A YR 1983 UL http://jmg.bmj.com/content/20/1/78.abstract AB