title: First, do no harm... To early pregnancies.
authors.forename: Peter M
authors.initials: PM
authors.lastname: Doubilet
authors.forename: Carol B
authors.initials: CB
authors.lastname: Benson
mesh_terms: D003951:Diagnostic Errors / Q000941:ethics / Q000517:prevention & control*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000000981:diagnostic imaging*; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal / Q000379:methods*