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 E05 Investigative Techniques D008919 +
  E05.318 Epidemiologic Methods D004812 +
   E05.318.308 Data Collection D003625 +
    E05.318.308.420 Interviews D007407 +
      E05.318.308.420.200 Focus Groups D017144 

 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.520 Epidemiologic Methods D004812 +
    G03.850.520.308 Data Collection D003625 +
     G03.850.520.308.420 Interviews D007407 +
       G03.850.520.308.420.200 Focus Groups D017144 

 L01 Information Science D007254 +
  L01.280 Data Collection D003625 +
   L01.280.520 Interviews D007407 +
     L01.280.520.200 Focus Groups D017144 

 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 +
     N05.715.360.300.400 Interviews D007407 +
       N05.715.360.300.400.350 Focus Groups D017144