DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
Westin M, Saltvedt S, Bergman G et al.
Routine ultrasound examination at 12 or 18 gestational weeks for prenatal
detection of major congenital heart malformations? A randomized controlled trial
comprising 36,299 fetuses.
BJOG 2006;
113: 675-682
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