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Absence of nasal bone in fetuses with trisomy 21 at 11–14 weeks of gestation: an observational study
Lancet, The, 2001Jiri Sonek, Kypros Nicolaides
exaly
Absence of nasal bone in fetuses with trisomy 21 at 11–14 weeks of gestation: an observational study
Lancet, The, 2001