National trends in hospital advertising.
D000329:Advertising / Q000706:statistics & numerical data*; D002391:Catchment Area, Health; D004465:Economic Competition; D005069:Evaluation Studies as Topic; D006739:Hospital Administration; D008389:Marketing of Health Services / Q000379:methods*; D008402:Mass Media; D015233:Models, Statistical; D010934:Planning Techniques; D012494:Sampling Studies; D011795:Surveys and Questionnaires; D014481:United States