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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 +
     E05.318.760.550 Feasibility Studies D005240 
     E05.318.760.750 Pilot Projects D010865 
     E05.318.760.875 Sampling Studies D012494 
     E05.318.760.500 Epidemiologic Studies D016021 +
     E05.318.760.565 Intervention Studies D016033 
     E05.318.760.900 Twin Studies D018433 

 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 +
      G03.850.520.450.550 Feasibility Studies D005240 
      G03.850.520.450.720 Pilot Projects D010865 
      G03.850.520.450.875 Sampling Studies D012494 
      G03.850.520.450.500 Epidemiologic Studies D016021 +
      G03.850.520.450.565 Intervention Studies D016033 
      G03.850.520.450.900 Twin Studies D018433 

 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 +
      N05.715.360.775.225 Clinical Protocols D002985 +
      N05.715.360.775.235 Clinical Trials D002986 +
      N05.715.360.775.350 Feasibility Studies D005240 
      N05.715.360.775.625 Pilot Projects D010865 
      N05.715.360.775.700 Sampling Studies D012494 
      N05.715.360.775.175 Epidemiologic Studies D016021 +
      N05.715.360.775.390 Intervention Studies D016033 
      N05.715.360.775.750 Twin Studies D018433