1. Clinical management guidelines for obstetricians-gynecologists: prenatal diagnosis of fetal chromosomal abnormalities;Obstet Gynecol,2001
2. Periodic health examination, 1996 update: 1. Prenatal screening for and diagnosis of Down syndrome. Canadian Task Force on the Periodic Health Examination;Dick;Can Med Assoc J,1996
3. Antenatal diagnosis: report of a consensus development conference;National Institute of Child Health and Human Development,1979
4. Indications for amniocentesis;Lubs,1972
5. The economics of prenatal genetic diagnosis;Conley,1975