RT Journal Article SR Electronic T1 Survival in trisomy 13 and trisomy 18 cases ascertained from population based registers JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP e54 OP e54 DO 10.1136/jmg.39.9.e54 VO 39 IS 9 A1 C M Brewer A1 S H Holloway A1 D H Stone A1 A D Carothers A1 D R FitzPatrick YR 2002 UL http://jmg.bmj.com/content/39/9/e54.abstract AB