Fetal heart rates.
DuBose
T J
TJ
Butschek
C M
CM
Hill
L W
LW
Dickey
D
D
Porter
L
L
Poole
E K
EK
D005260:Female; D005865:Gestational Age; D006340:Heart Rate, Fetal; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014463:Ultrasonography