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    M. Agathokleous, P. Chaveeva, L. C. Y. Poon, P. Kosinski, K. H. Nicolaides, Meta-analysis of second-trimester markers for trisomy 21, Ultrasound in Obstetrics & Gynecology, 2013, 41, 3
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    J.S. Dungan, Intracardiac echogenic focus and trisomy 21 in a population previously evaluated by first-trimester combined screening, Yearbook of Obstetrics, Gynecology and Women's Health, 2011, 2011, 54

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