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 H01 Natural Sciences D010811 +
  H01.770 Science D012586 +
   H01.770.644 Research D012106 +
    H01.770.644.728 Research Design D012107 +
      H01.770.644.728.300 Double-Blind Method D004311 
      H01.770.644.728.805 Random Allocation D011897 
      H01.770.644.728.501 Meta-Analysis D015201 
      H01.770.644.728.902 Sample Size D018401 
      H01.770.644.728.653 Patient Selection D018579 
      H01.770.644.728.149 Control Groups D035061