All

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 G02 Health Occupations D006281 +
  G02.403 Medicine D008511 +
   G02.403.776 Specialties, Medical D013040 +
    G02.403.776.630 Preventive Medicine D011315 +
     G02.403.776.630.250 Environmental Medicine D019550 
 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.420 Environmental Medicine D019550