Kevin Spencer and Kypros H. Nicolaides Screening for trisomy 21 in twins using first trimester ultrasound and maternal serum biochemistry in a one-stop clinic: a review of three years experience BJOG: An International Journal of Obstetrics & Gynaecology 110
Article first published online: 22 DEC 2003 | DOI: 10.1046/j.1471-0528.2003.02222.x
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