All

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 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.780 Public Health Practice D015980 +
    G03.850.780.680 Primary Prevention D011322 +
      G03.850.780.680.310 Immunization D007114 +
 N02 Health Care Facilities, Manpower, and Services D005159 +
  N02.421 Health Services D006296 +
   N02.421.726 Preventive Health Services D011314 +
    N02.421.726.758 Primary Prevention D011322 +
      N02.421.726.758.310 Immunization D007114 +