Screening for trisomy 21 by fetal tricuspid regurgitation, nuchal translucency and maternal serum free β‐hCG and PAPP‐A at 11 + 0 to 13 + 6 weeks
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K. Spencer | K. Nicolaides | A. Gerovassili | O. Falcón | M. Auer | Kypros H. Nicolaides | Kevin Spencer