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Maternal urinary free fl‐subunit of human chorionic gonadotrophin:creatinine ratios and fetal chromosomal abnormalities in the second trimester of pregnancy
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Journal
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- BJOG: An International Journal of Obstetrics & Gynaecology
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BJOG: An International Journal of Obstetrics & Gynaecology 103 577-580, 1996-06-01
Wiley