The distribution of prepaid physician services in medical group practice: U.S. 1975.
D006123:Group Practice / Q000600:supply & distribution*; D006125:Group Practice, Prepaid / Q000600:supply & distribution*; D006295:Health Resources / Q000600:supply & distribution; D006301:Health Services Needs and Demand; D012044:Regression Analysis; D012424:Rural Population; D014481:United States; D014505:Urban Population