We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleMaternal contributions to preterm delivery.AuthorsBoyd HA; Poulsen G; Wohlfahrt J; Murray JC; Feenstra B; Melbye MPublicationAmerican journal of epidemiology, 2009, Vol 170, Issue 11, p1358ISSN1476-6256Publication typearticleDOI10.1093/aje/kwp324