Screening performance of different methods defining fetal nasal bone hypoplasia as a single and combined marker for the detection of trisomy 21 in the second trimester by Papasozomenou, Panayiota, Athanasiadis, Apostolos P., Zafrakas, Menelaos, Panteris, Eleftherios, Mikos, Themistokles, Daniilidis, Angelos, Loufopoulos, Aristoteles, Assimakopoulos, Efstratios, Tarlatzis, Basil C.

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