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Expanded conventional first trimester screening.
Carmichael JB, Liu HP, Janik D, Hallahan TW, Nicolaides KH, Krantz DA.
Prenat Diagn 2017;37:802-807. pdf -
First-trimester screening for trisomy 21 using nuchal translucency and nasal bone evaluations in a selected and an unselected population.
Sonek J, Cicero S, Nicolaides K.
Am J Obstet Gynecol 2007;196:19.