title: The new obstetric ultrasound guidelines: some concerns.
authors.forename: Joshua L
authors.initials: JL
authors.lastname: Schreckengost
authors.forename: Roy A
authors.initials: RA
authors.lastname: Filly
mesh_terms: D006801:Humans; D009774:Obstetrics / Q000592:standards / Q000639:trends; D017410:Practice Guidelines as Topic; D010818:Practice Patterns, Physicians' / Q000592:standards / Q000639:trends; D016216:Ultrasonography, Prenatal / Q000592:standards / Q000639:trends; D014481:United States