The role of ultrasound in the clinical practice of obstetrics.
Cohen
A W
AW
Division of Maternal-Fetal Medicine, Hospital of the University of Pennsylvania, University of Pennsylvania School of Medicine, Philadelphia 19104.
Lindenbaum
C R
CR
Jackson
G M
GM
Forouzan
I
I
Eife
S B
SB
D005260:Female; D006801:Humans; D011247:Pregnancy; D016216:Ultrasonography, Prenatal