Alteration in age-specific risks for chromosomal trisomy by maternal serum alpha-fetoprotein and human chorionic gonadotropin screening

1991 ◽  
Vol 11 (3) ◽  
pp. 153-158 ◽  
Author(s):  
C. H. Miller ◽  
T. J. O'Brien ◽  
S. Chatelain ◽  
B. B. Butler ◽  
J. G. Quirk
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