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 G02 Health Occupations D006281 +
  G02.403 Medicine D008511 +
   G02.403.776 Specialties, Medical D013040 +
    G02.403.776.409 Internal Medicine D007388 +
      G02.403.776.409.163 Cardiology D002309 
      G02.403.776.409.323 Endocrinology D004704 
      G02.403.776.409.405 Gastroenterology D005762 
      G02.403.776.409.445 Hematology D006405 
      G02.403.776.409.515 Medical Oncology D008495 +
      G02.403.776.409.580 Nephrology D009398 
      G02.403.776.409.730 Rheumatology D012219 
      G02.403.776.409.675 Pulmonary Disease (Specialty) D015272