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Journal Article
Obstetrics & Gynecology, ISSN 0029-7844, 05/2009, Volume 113, Issue 5, pp. 1117 - 1123
Journal Article
Journal Article
Contraception, ISSN 0010-7824, 2011, Volume 84, Issue 1, pp. 4 - 18
Journal Article
American Family Physician, ISSN 0002-838X, 11/2007, Volume 76, Issue 9, pp. 1341 - 1348
Journal Article
The Cochrane database of systematic reviews, ISSN 1469-493X, 2015, Volume 11, Issue 11, p. CD011975
Background Down's syndrome occurs when a person has three, rather than two copies of chromosome 21; or the specific area of chromosome 21 implicated in causing... 
2ND-TRIMESTER ULTRASOUND EXAMINATION | NASAL BONE LENGTH | MEDICINE, GENERAL & INTERNAL | ALPHA-FETOPROTEIN LEVELS | DIMERIC INHIBIN-A | FETAL NUCHAL-TRANSLUCENCY | IN-VITRO FERTILIZATION | HUMAN CHORIONIC-GONADOTROPIN | NEURAL-TUBE DEFECT | FREE-BETA-HCG | PLASMA-PROTEIN-A
Journal Article