Second-trimester Down syndrome maternal serum marker screening: a prospective study of 11 040 twin pregnancies
Keyword(s):
Keyword(s):
Keyword(s):
1999 ◽
Vol 19
(10)
◽
pp. 905-910
◽
Keyword(s):
1997 ◽
Vol 57
(3)
◽
pp. 345-345
2020 ◽