title: Medicare squeezes urban MDs.
authors.forename: R N
authors.initials: RN
authors.lastname: Butler
mesh_terms: D005251:Fees, Medical / Q000639:trends*; D006801:Humans; D006278:Medicare / Q000191:economics*; D011320:Primary Health Care / Q000191:economics*; D014481:United States; D014504:Urban Health