title: Techniques differ in use of Doppler ultrasonography.
authors.forename: T R
authors.initials: TR
authors.lastname: Easterling
authors.forename: T J
authors.initials: TJ
authors.lastname: Benedetti
mesh_terms: D015150:Echocardiography, Doppler / Q000379:methods; D005260:Female; D006801:Humans; D011247:Pregnancy / Q000502:physiology*