Our health care delivery systems.
D054598:Blue Cross Blue Shield Insurance Plans; D003695:Delivery of Health Care; D004470:Economics, Medical; D004501:Education, Medical / Q000266:history / Q000592:standards; D005060:Europe; D005860:Germany, West; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007348:Insurance, Health; D009313:National Health Programs; D014481:United States