The index of medical underservice: problems in meaning, measurement, and use.
D000367:Age Factors; D000368:Aged; D005069:Evaluation Studies as Topic; D006279:Health Maintenance Organizations; D006285:Health Planning; D006296:Health Services / Q000600:supply & distribution*; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D010820:Physicians / Q000600:supply & distribution; D011203:Poverty; D011320:Primary Health Care; D014481:United States