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The New England Journal of Medicine|March 9, 1989
The safety and efficacy of chorionic villus sampling for early prenatal diagnosis of cytogenetic abnormalitiesG G Rhoads, L G Jackson, S E Schlesselman, et al.
Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology|April 16, 2002
First-trimester trisomy screening: nuchal translucency measurement training and quality assurance to correct and unify techniqueR J M Snijders, E A Thom, J M Zachary, et al.
Obstetrics and Gynecology|June 3, 2004
Late first-trimester invasive prenatal diagnosis: results of an international randomized trialJ Philip, R K Silver, R D Wilson, et al.
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