The extent of Down's syndrome screening in Britain in 1991.
Wald
N
N
Wald
K
K
Smith
D
D
D000328:Adult; D006063:Chorionic Gonadotropin / Q000097:blood; D004314:Down Syndrome / Q000097:blood* / Q000517:prevention & control; D004958:Estradiol / Q000097:blood; D005260:Female; D006302:Health Services Research; D006801:Humans; D008403:Mass Screening / Q000379:methods*; D008423:Maternal Age; D006113:United Kingdom; D000509:alpha-Fetoproteins / Q000737:chemistry
D006063:Chorionic Gonadotropin; D000509:alpha-Fetoproteins; D004958:Estradiol