1. 88, December 2007. Invasive prenatal testing for aneuploidy. American College of Obstetricians and Gynecologists.;Obstet Gynecol,2007
2. U.S. national trends in labor induction, 1989-1998.;Zhang;J Reprod Med,2002
3. Committee Opinion No. 561. American College of Obstetricians and Gynecologists.;Obstet Gynecol,2013
4. Liquor amnii analysis in management of pregnancy complicated by rhesus immunization.;Liley;Am J Obstet Gynecol,1961
5. Noninvasive diagnosis by Doppler ultrasonography of fetal anemia due to maternal red-cell alloimmunization.;Mari;N Engl J Med,2000