Frontomaxillary facial angles in screening for trisomy 21 at 14-23 weeks’ gestation by Sonek, Jiri, MD, Borenstein, Marisa, MD, Downing, Cathy, RT, RDMS, RVT, McKenna, David, MD, Neiger, Ran, MD, Croom, Christopher, MD, Genrich, Toby, MD, Nicolaides, Kypros H., MD

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