title: What is second stage?
authors.forename: D
authors.initials: D
authors.lastname: Barnes
mesh_terms: D002584:Cervix Uteri / Q000502:physiology; D005260:Female; D006801:Humans; D007748:Labor Stage, Second / Q000502:physiology*; D008880:Midwifery / Q000379:methods*; D011247:Pregnancy