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First‐trimester combined screening for trisomy 21 at 7–14 w..:

Wright, D. ; Spencer, K. ; Kagan K, K....
Ultrasound in Obstetrics & Gynecology.  36 (2010)  4 - p. 404-411 , 2010
Link: https://doi.org/10.1002/uog.7755