DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Yang X, Chen M, Wang HF. et al
Learning curve in measurement of fetal frontomaxillary facial angle at 11 – 13 weeks of gestation.
Ultrasound Obstet Gynecol 2010; 35: 530-534
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