Comparative medical care use under prepaid group practice and free choice plans: a case study.
D000328:Adult; D000367:Age Factors; D005260:Female; D006123:Group Practice; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D007348:Insurance, Health; D008297:Male; D008875:Middle Aged; D010548:Personal Health Services / Q000706:statistics & numerical data*; D010820:Physicians / Q000706:statistics & numerical data; D012737:Sex Factors; D014481:United States