title: Different rates of prolonged first-stage labor in primiparas at two hospitals.
authors.forename: M
authors.initials: M
authors.lastname: Thomson
mesh_terms: D005260:Female; D006764:Hospitals, Community; D006782:Hospitals, Special; D006801:Humans; D007747:Labor Stage, First / Q000502:physiology*; D007743:Labor, Obstetric / Q000502:physiology*; D007744:Obstetric Labor Complications / Q000503:physiopathology*; D011247:Pregnancy; D011792:Quebec; D013997:Time Factors