Second stage labor--has tradition replaced safety?
D000328:Adult; D005260:Female; D006801:Humans; D007748:Labor Stage, Second; D007743:Labor, Obstetric; D009774:Obstetrics / Q000639:trends*; D011187:Posture; D011247:Pregnancy; D012119:Respiration; D014636:Valsalva Maneuver