title: Comment and reply on: prediction of the date of delivery based on first trimester ultrasound measurements: an independent method from estimated date of conception.
authors.forename: Håkon K
authors.initials: HK
authors.lastname: Gjessing
authors.forename: Per
authors.initials: P
authors.lastname: Grøttum
authors.forename: Inger
authors.initials: I
authors.lastname: Okland
authors.forename: Sturla H
authors.initials: SH
authors.lastname: Eik-Nes
mesh_terms: D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal