Hellinger, F. J. (1987). Selection bias in health maintenance organizations: Analysis of recent evidence. CENTERS for MEDICARE & MEDICAID SERVICES.
Chicago-tyylinen lähdeviittausHellinger, Fred J. Selection Bias in Health Maintenance Organizations: Analysis of Recent Evidence. CENTERS for MEDICARE & MEDICAID SERVICES, 1987.
MLA-viiteHellinger, Fred J. Selection Bias in Health Maintenance Organizations: Analysis of Recent Evidence. CENTERS for MEDICARE & MEDICAID SERVICES, 1987.
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