Acceleration time in the aorta and pulmonary artery measured by Doppler echocardiography in the midtrimester normal human fetus.
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Kitabatake A, Inoue M, Asao M, et al. Non-invasive evaluation of pulmonary hypertension by pulsed Doppler technique. Circulation 1983;68:302-9.
Rudolph AM. Organization and control of the fetal circulation. In: Jones CT, Nathanielsz PW, eds. The physiological development of the fetus and newborn. London: Academic Press, 1985:343-53.