DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
Cicero S, Curcio P, Papageorghiou A, Sonek J, Nicolaides K.
Absence of nasal bone in fetuses with trisomy 21 at 11 - 14 weeks of gestation: an observational study.
Lancet 2001; 358: 1665-1667
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