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 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.490 Epidemiologic Factors D015981 +
    G03.850.490.734 Effect Modifiers (Epidemiology) D015987 +
      G03.850.490.734.500 Cohort Effect D015988 
      G03.850.490.734.750 Healthy Worker Effect D015989 
      G03.850.490.734.875 Placebo Effect D015990 


 N05 Health Care Quality, Access, and Evaluation D017530 +
  N05.715 Quality of Health Care D011787 +
   N05.715.350 Epidemiologic Factors D015981 +
    N05.715.350.350 Effect Modifiers (Epidemiology) D015987 +
      N05.715.350.350.225 Cohort Effect D015988 
      N05.715.350.350.375 Healthy Worker Effect D015989 
      N05.715.350.350.625 Placebo Effect D015990