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The New England Journal of Medicine|October 10, 2003
First-trimester screening for trisomies 21 and 18Ronald Wapner, Elizabeth Thom, Joe Leigh Simpson, et al.Obstetrics and Gynecology|October 2, 2004
Sequential pathways of testing after first-trimester screening for trisomy 21Lawrence D Platt, Naomi Greene, Anthony Johnson, et al.Pageof 6