Research on the fetus using Doppler ultrasound in the first trimester: guiding ethical considerations.
Chervenak
F A
FA
McCullough
L B
LB
D004992:Ethics, Medical; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D012106:Research; D018608:Ultrasonography, Doppler; D016216:Ultrasonography, Prenatal