RT Journal Article SR Electronic T1 Catalog of Prenatally Diagnosed Conditions JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 215 OP 215 DO 10.1136/jmg.27.3.215 VO 27 IS 3 A1 Dennis, N R YR 1990 UL http://jmg.bmj.com/content/27/3/215.1.abstract AB