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Some thoughts on the true value of ultrasound.
Nicolaides KH.
Ultrasound Obstet Gynecol 2007;30:671-4. -
The mitral gap at 11 + 0 to 13 + 6 weeks: marker of trisomy 21 or artifact?
Maiz N, Dagklis T, Huggon I, Allan L, Nicolaides KH.
Ultrasound Obstet Gynecol 2007;30:813-8.