Maternal urinary free beta-subunit of human chorionic gonadotrophin: creatinine ratios and fetal chromosomal abnormalities in the second trimester of pregnancy
- PMID: 8645653
- DOI: 10.1111/j.1471-0528.1996.tb09810.x
Maternal urinary free beta-subunit of human chorionic gonadotrophin: creatinine ratios and fetal chromosomal abnormalities in the second trimester of pregnancy
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