The lambda sign in twin pregnancies.
Sepulveda
W
W
Sebire
N J
NJ
Nicolaides
K H
KH
D002823:Chorion / Q000000981:diagnostic imaging*; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014427:Twins; D016216:Ultrasonography, Prenatal