Integrated systems own more providers.
Johnson
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D003284:Contract Services / Q000706:statistics & numerical data; D003625:Data Collection; D019033:Delivery of Health Care, Integrated / Q000706:statistics & numerical data* / Q000639:trends; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data; D006801:Humans; D010067:Ownership / Q000706:statistics & numerical data; D011216:Practice Management, Medical / Q000706:statistics & numerical data*; D011243:Preferred Provider Organizations / Q000706:statistics & numerical data; D014481:United States