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American Journal of Obstetrics and Gynecology|September 11, 2007
Stepwise sequential screening for fetal aneuploidyPeter A Benn, Winston A Campbell, Carolyn M Zelop, et al.Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine|April 22, 2004
Correlation of second-trimester sonographic and biochemical markersVivienne L Souter, David A Nyberg, Peter A Benn, et al.Prenatal Diagnosis|March 29, 2011
Distortions of sex ratios at birth in the United States; evidence for prenatal gender selectionJames F X Egan, Winston A Campbell, Audrey Chapman, et al.Prenatal Diagnosis|February 9, 2011
Demographic differences in Down syndrome livebirths in the US from 1989 to 2006James F X Egan, Kathleen Smith, Diane Timms, et al.Obstetrics and Gynecology|February 3, 2007
Absent or shortened nasal bone length and the detection of Down Syndrome in second-trimester fetusesElisa A Gianferrari, Peter A Benn, Lisa Dries, et al.Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine|November 19, 2003
Combined sonographic and biochemical markers for Down syndrome screeningMichael G Pinette, James F X Egan, Joseph R Wax, et al.American Journal of Obstetrics and Gynecology|October 7, 2004
Down syndrome births in the United States from 1989 to 2001James F X Egan, Peter A Benn, Carolyn M Zelop, et al.American Journal of Obstetrics and Gynecology|November 20, 2002
Antenatal Down syndrome screening in the United States in 2001: a survey of maternal-fetal medicine specialistsJames F X Egan, Lillian M Kaminsky, Michael E DeRoche, et al.Pageof 2