All

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 E05 Investigative Techniques D008919 +
  E05.318 Epidemiologic Methods D004812 +
   E05.318.760 Epidemiologic Study Characteristics D016020 +
    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 +
     G03.850.520.450.900 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 +
     N05.715.360.775.750 Twin Studies D018433