1. An epidemologic survey of twins in a large, prospectively studied population;Myrian Thopoulos;Am J Hum Genet,1970
2. Rates of chromosomal abnormalities of different maternal ages;Hook;Obstet Gynecol,1981
3. Chromosomal abnormality rates at amniocentesis and live born infants;Hook;JAMA,1983
4. Counseling problems when twins are discussed at genetic amniocentesis;Hunter;Clin Genet,1979
5. Calculated risk of chromosomal abnormalities in twin gestations;Rodis;Obstet Gynecol,1990