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NEJM -- Wapner R et al. First-Trimester Screening for Trisomies 21 and 18. 349(15):1405-13. Supplementary Appendix 1 Article: Wapner R et al. First-Trimester Screening for Trisomies 21 and 18. N Engl J Med 2003;349(15):1405-13.




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 Supplementary Appendix 1. Estimated Number of Viable Pregnancies Involving Trisomy 21 in the Current Study.  
 


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