title: The impact of health systems agencies on urban ambulatory health centers.
mesh_terms: D000553:Ambulatory Care / Q000458:organization & administration*; D003151:Community Health Centers / Q000458:organization & administration*; D003153:Community Health Services / Q000458:organization & administration*; D006307:Health Systems Agencies / Q000458:organization & administration*; D014481:United States; D014505:Urban Population