title: Gestational age: not always what it seems.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Klebanoff
mesh_terms: D001719:Birth Certificates; D001724:Birth Weight / Q000502:physiology*; D004282:Documentation / Q000592:standards; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008598:Menstruation; D011247:Pregnancy; D015203:Reproducibility of Results