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 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.490 Epidemiologic Factors D015981 +
    G03.850.490.500 Bias (Epidemiology) D015982 +
     G03.850.490.500.500 Selection Bias D015983 


 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 +
     N05.715.350.150.775 Selection Bias D015983