1. Rates of trisomies;Schreinemachers, D.M.; Cross, P.K.; Hook, E.B.;Hum Genet; and other chromosome abnormalities in about 20000 prenatal studies compared with estimated rates in livebirths,1982
2. Prenatal chromosome analysis and its impact;Ferguson-Smith, M.A.;BrMedBull,1983
3. Cytogenetic prenatal diagnosis and its relative effectiveness in the Mersey region and north Wales;Walker, S.; Howard, P.J.;Prenat Diagn,1986
4. Population Censuses and Surveys. Birth Statistics;Office of,1985
5. Revised estimates and projections of Down's syndrome births in the United States and the effects of prenatal diagnosis utilisation, 1970-2002;Goodwin, B.A.; Huether, C.A.;Prenat Diagn,1987