All

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 E06 Dentistry D003813 +
  E06.761 Preventive Dentistry D011313 +
   E06.761.382 Fluoridation D005457 
 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.860 Sanitation D012499 +
    G03.850.860.510 Sanitary Engineering D012498 +
     G03.850.860.510.915 Water Supply D014881 +
      G03.850.860.510.915.300 Fluoridation D005457 
 G03 Environment and Public Health D004778 +
  G03.890 Public Health Dentistry D011636 +
   G03.890.235 Fluoridation D005457