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 E05 Investigative Techniques D008919 +
  E05.318 Epidemiologic Methods D004812 +
   E05.318.760 Epidemiologic Study Characteristics D016020 +
    E05.318.760.535 Clinical Trials D002986 +
      E05.318.760.535.500 Multicenter Studies D015337 
      E05.318.760.535.200 Clinical Trials, Phase I D017321 
      E05.318.760.535.210 Clinical Trials, Phase II D017322 
      E05.318.760.535.220 Clinical Trials, Phase III D017326 
      E05.318.760.535.230 Clinical Trials, Phase IV D017327 
      E05.318.760.535.365 Controlled Clinical Trials D018849 +

 E05 Investigative Techniques D008919 +
  E05.337 Evaluation Studies D005069 +
   E05.337.250 Clinical Trials D002986 +
     E05.337.250.500 Multicenter Studies D015337 
     E05.337.250.200 Clinical Trials, Phase I D017321 
     E05.337.250.210 Clinical Trials, Phase II D017322 
     E05.337.250.220 Clinical Trials, Phase III D017326 
     E05.337.250.230 Clinical Trials, Phase IV D017327 
     E05.337.250.365 Controlled Clinical Trials D018849 +

 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.520 Epidemiologic Methods D004812 +
    G03.850.520.450 Epidemiologic Study Characteristics D016020 +
     G03.850.520.450.535 Clinical Trials D002986 +
       G03.850.520.450.535.500 Multicenter Studies D015337 
       G03.850.520.450.535.200 Clinical Trials, Phase I D017321 
       G03.850.520.450.535.210 Clinical Trials, Phase II D017322 
       G03.850.520.450.535.220 Clinical Trials, Phase III D017326 
       G03.850.520.450.535.230 Clinical Trials, Phase IV D017327 
       G03.850.520.450.535.365 Controlled Clinical Trials D018849 +

 N05 Health Care Quality, Access, and Evaluation D017530 +
  N05.715 Quality of Health Care D011787 +
   N05.715.360 Health Care Evaluation Mechanisms D017531 +
    N05.715.360.775 Epidemiologic Study Characteristics D016020 +
     N05.715.360.775.235 Clinical Trials D002986 +
       N05.715.360.775.235.545 Multicenter Studies D015337 
       N05.715.360.775.235.200 Clinical Trials, Phase I D017321 
       N05.715.360.775.235.210 Clinical Trials, Phase II D017322 
       N05.715.360.775.235.220 Clinical Trials, Phase III D017326 
       N05.715.360.775.235.230 Clinical Trials, Phase IV D017327 
       N05.715.360.775.235.387 Controlled Clinical Trials D018849 +