All

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 N02 Health Care Facilities, Manpower, and Services D005159 +
  N02.278 Health Facilities D006268 +
   N02.278.354 Hospital Administration D006739 +
    N02.278.354.422 Hospital Departments D006748 +
     N02.278.354.422.412 Housekeeping, Hospital D006797 
 N02 Health Care Facilities, Manpower, and Services D005159 +
  N02.508 Housekeeping D006796 +
   N02.508.472 Housekeeping, Hospital D006797 
 N04 Health Services Administration D006298 +
  N04.452 Organization and Administration D009934 +
   N04.452.442 Hospital Administration D006739 +
    N04.452.442.422 Hospital Departments D006748 +
     N04.452.442.422.412 Housekeeping, Hospital D006797