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2. Cytogenetic analysis of 1375 amniotic fluid specimens from pregnancies with gestational age less than 14 weeks;Lockwood;Prenat Diagn,1993
3. Maternal age specific rates of 47,121 and other cytogenetic abnormalities diagnosed in the first trimester of pregnancy in chorionic villus biopsy specimens: comparison with rates expected from observations at amniocentesis;Hook;Am J Hum Genet,1988
4. Incidence of fetal chromosome abnormalities in 2264 low-risk women;Tabor;Prenat Diagn,1987