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Utilization of second trimester maternal serum screening for down syndrome by advanced maternal age women Peter Benn, James Egan American Journal of Obstetrics & Gynecology Volume 191, Issue 6, (December 2004) DOI: /j.ajog Copyright © 2004 Elsevier Inc. Terms and Conditions
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American Journal of Obstetrics & Gynecology 2004 191, DOI: (10. 1016/j
American Journal of Obstetrics & Gynecology , DOI: ( /j.ajog ) Copyright © 2004 Elsevier Inc. Terms and Conditions
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