1. Prenatal diagnosis of chromosome abnormalities through amniocentesis;Benn,2004
2. Developmental Pathology of the Embryo and Fetus;Dimmick,1992
3. Chromosome Abnormalities and Genetic Counseling;Gardner,2003
4. Screening for fetal chromosomal abnormalities;ACOG Practice Bulletin #77;Obstet Gynecol,2007
5. Pregnancy loss rates after midtrimester amniocentesis;Eddleman;Obstet Gynecol,2006