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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