All

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 E05 Investigative Techniques D008919 +
  E05.318 Epidemiologic Methods D004812 +
   E05.318.780 Epidemiologic Research Design D015340 +
    E05.318.780.074 Control Groups D035061 
 H01 Natural Sciences D010811 +
  H01.770 Science D012586 +
   H01.770.644 Research D012106 +
    H01.770.644.728 Research Design D012107 +
     H01.770.644.728.149 Control Groups D035061