Obstetric ultrasound--an issue of quality.
Merritt
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CR
D004501:Education, Medical; D005260:Female; D006801:Humans; D008318:Malpractice; D008511:Medicine / Q000592:standards*; D011247:Pregnancy; D011787:Quality of Health Care; D013038:Specialization; D016216:Ultrasonography, Prenatal / Q000592:standards*