Provider-based surveys of health care use from the National Center for Health Statistics: an appraisal of their scope and content.
D000368:Aged; D000553:Ambulatory Care / Q000706:statistics & numerical data; D006296:Health Services / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D009309:National Center for Health Statistics, U.S.; D009735:Nursing Homes; D009819:Office Visits / Q000706:statistics & numerical data; D014481:United States; D014492:United States Public Health Service