title: Estimating date of delivery and gestational age - technology, biology or both?
authors.forename: Dag
authors.initials: D
authors.lastname: Bratlid
mesh_terms: D005260:Female; D005865:Gestational Age; D006801:Humans; D008598:Menstruation; D011247:Pregnancy; D015203:Reproducibility of Results; D016216:Ultrasonography, Prenatal