title: Chorionicity determination in twin pregnancies: double trouble.
authors.forename: W
authors.initials: W
authors.lastname: Sepulveda
mesh_terms: D002823:Chorion / Q000000981:diagnostic imaging*; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D011272:Pregnancy, Multiple; D014427:Twins; D016216:Ultrasonography, Prenatal