X-rays for childbirth: risky, costly, not always helpful.
D003955:Diagnostic Tests, Routine / Q000592:standards*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D010387:Pelvimetry / Q000592:standards / Q000706:statistics & numerical data*; D011247:Pregnancy; D014481:United States