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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 N05 Health Care Quality, Access, and Evaluation D017530 +
 N05.715 Quality of Health Care D011787 +
 N05.715.350 Epidemiologic Factors D015981 +
 N05.715.350.150 Bias (Epidemiology) D015982 +
 N05.715.350.150.675 Observer Variation D015588 
 N05.715.350.150.775 Selection Bias D015983