All

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 E05 Investigative Techniques D008919 +
  E05.318 Epidemiologic Methods D004812 +
   E05.318.308 Data Collection D003625 +
    E05.318.308.250 Health Surveys D006306 +
     E05.318.308.250.300 Dental Health Surveys D003753 +
      E05.318.308.250.300.725 Periodontal Index D010512 
 E06 Dentistry D003813 +
  E06.208 Dental Health Surveys D003753 +
   E06.208.720 Periodontal Index D010512 
 E06 Dentistry D003813 +
  E06.721 Periodontics D010517 +
   E06.721.658 Periodontal Index D010512 
 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.520 Epidemiologic Methods D004812 +
    G03.850.520.308 Data Collection D003625 +
     G03.850.520.308.250 Health Surveys D006306 +
      G03.850.520.308.250.300 Dental Health Surveys D003753 +
       G03.850.520.308.250.300.725 Periodontal Index D010512 
 G03 Environment and Public Health D004778 +
  G03.890 Public Health Dentistry D011636 +
   G03.890.160 Dental Health Surveys D003753 +
    G03.890.160.215 Periodontal Index D010512 
 N05 Health Care Quality, Access, and Evaluation D017530 +
  N05.715 Quality of Health Care D011787 +
   N05.715.360 Health Care Evaluation Mechanisms D017531 +
    N05.715.360.300 Data Collection D003625 +
     N05.715.360.300.375 Health Surveys D006306 +
      N05.715.360.300.375.300 Dental Health Surveys D003753 +
       N05.715.360.300.375.300.690 Periodontal Index D010512