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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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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 +
      G02.403.776.630.510 Occupational Medicine D009787 
      G02.403.776.630.550 Preventive Psychiatry D011316 
      G02.403.776.630.250 Environmental Medicine D019550