title: Parity, prolonged labor and epidural analgesia.
authors.forename: F R
authors.initials: FR
authors.lastname: Witter
authors.forename: L E
authors.initials: LE
authors.lastname: Caulfield
mesh_terms: D015360:Analgesia, Epidural; D016362:Analgesia, Obstetrical; D005260:Female; D006801:Humans; D007744:Obstetric Labor Complications; D010298:Parity; D011247:Pregnancy; D013997:Time Factors