The implications of national health insurance for ambulatory care services in New York City.
D000553:Ambulatory Care; D009313:National Health Programs; D009519:New York City; D010820:Physicians
N Engl J Med. 1973 Nov 29;289(22):1174-8
4754965
N Engl J Med. 1973 May 31;288(22):1152-5
4699745