title: Ultrasound is not unsound, but safety is an issue.
authors.affiliation: National Center for Fetal Medicine, St Olav University Hospital of Trondheim and Department of Laboratory Medicine, Women's and Child Health, Norwegian University of Science and Technology, Trondheim, Norway. pepes@ntnu.no
authors.forename: K A
authors.initials: KA
authors.lastname: Salvesen
authors.forename: C
authors.initials: C
authors.lastname: Lees
mesh_terms: D005260:Female; D006801:Humans; D017410:Practice Guidelines as Topic; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D012307:Risk Factors; D011795:Surveys and Questionnaires; D016216:Ultrasonography, Prenatal / Q000009:adverse effects* / Q000592:standards