Changes in obstetric practice between 1952 and 1977.
D001290:Attitude; D000013:Congenital Abnormalities; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007743:Labor, Obstetric; D009774:Obstetrics / Q000639:trends*; D011247:Pregnancy; D012151:Resuscitation; D006113:United Kingdom