The publishing of papers on first-trimester Doppler.
Campbell
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S
Platt
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D004992:Ethics, Medical; D005260:Female; D006801:Humans; D010506:Periodicals as Topic; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D012449:Safety; D018615:Ultrasonography, Doppler, Color; D018617:Ultrasonography, Doppler, Pulsed; D016216:Ultrasonography, Prenatal