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Ekelund CK, Petersen OB, Skibsted L, Kjaergaard S, Vogel I, Tabor A; Danish Fetal Medicine Research Group. First-trimester screening for trisomy 21 in Denmark: implications for detection and birth rates of trisomy 18 and trisomy 13. Ultrasound Obstet Gynecol. 2011 Aug;38(2):140–4. doi: 10.1002/uog.8929. PMID: 21229566. |