title: Certain dates may not provide a reliable estimate of gestational age.
authors.affiliation: Department of Obstetrics and Gynaecology, University of Edinburgh.
authors.forename: R T
authors.initials: RT
authors.lastname: Geirsson
authors.forename: R M
authors.initials: RM
authors.lastname: Busby-Earle
mesh_terms: D000328:Adult; D005260:Female; D005865:Gestational Age; D006801:Humans; D008598:Menstruation; D011247:Pregnancy; D016216:Ultrasonography, Prenatal