title: Consistent definition of preterm birth: a research imperative!
authors.affiliation: Department of Pediatrics, Division of Neonatology, University of Washington, 1959 NE Pacific Street, Box 356320, Seattle, WA 98195. Electronic address: schabra@uw.edu.
authors.forename: Shilpi
authors.initials: S
authors.lastname: Chabra
mesh_terms: D005260:Female; D005865:Gestational Age; D006801:Humans; D008297:Male; D008598:Menstruation; D011247:Pregnancy; D047928:Premature Birth / Q000453:epidemiology*; D016216:Ultrasonography, Prenatal