Diagnostic content of ambulatory primary care: implications for resource utilization.
D000553:Ambulatory Care / Q000145:classification*; D003625:Data Collection; D003953:Diagnosis-Related Groups / Q000145:classification*; D006295:Health Resources / Q000706:statistics & numerical data; D006801:Humans; D011320:Primary Health Care / Q000706:statistics & numerical data*; D013223:Statistics as Topic; D014481:United States