A - Anatomy 
       
      
         
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    A11 - Cells 
      
       
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    B - Organisms 
       
      
         
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    B03 - Bacteria 
      
      B04 - Viruses 
      
       
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    C - Diseases 
       
      
         
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    C02 - Virus Diseases 
      
      C05 - Musculoskeletal Diseases 
      
      C12 - Male Urogenital Diseases 
      
      C13 - Female Urogenital Diseases and Pregnancy Complications 
      
      C15 - Hemic and Lymphatic Diseases 
      
      C16 - Congenital, Hereditary, and Neonatal Diseases 
      and Abnormalities 
      
      C17 - Skin and Connective Tissue Diseases 
      
      C18 - Nutritional and Metabolic Diseases 
      
      C20 - Immune System Diseases 
      
      C23 - Pathological Conditions, Signs and Symptoms 
      
      C25 - Substance-Related Disorders 
      
       
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    D - Chemicals and Drugs 
       
      
         
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    D01 - Inorganic Chemicals 
      
      D02 - Organic Chemicals 
      
      D03 - Heterocyclic Compounds 
      
      D04 - Polycyclic Compounds 
      
      D05 - Macromolecular Substances 
      
      D08 - Enzymes and Coenzymes 
      
      D09 - Carbohydrates 
      
      D12 - Amino Acids, Peptides, and Proteins 
      
      D13 - Nucleic Acids, Nucleotides, and Nucleosides 
      
      D20 - Complex Mixtures 
      
      D25 - Biomedical and Dental Materials 
      
       
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    E - Analytical, Diagnostic and Therapeutic Techniques 
      and Equipment 
       
      
         
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    E02 - Therapeutics 
      
      E04 - Surgical Procedures, Operative 
      
      
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    F - Psychiatry and Psychology 
       
      
         
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    F01 - Behavior and Behavior Mechanisms 
      
       
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    G - Phenomena and Processes 
       
      
         
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    G01 - Physical Phenomena 
      
      G15 - Plant Physiological Phenomena 
      
       
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    H - Disciplines and Occupations 
       
      
         
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    H02 - Health Occupations 
      
       
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    HP - Homeopathy 
       
      
         
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    HP4 - Materia Medica 
      
       
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    J - Technology, Industry, Agriculture 
       
      
         
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    J01 - Technology, Industry, and Agriculture 
      
       
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    K - Humanities 
       
      
         
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    K01 - Humanities 
      
        
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    M - Named Groups 
       
      
         
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    M01 - Persons 
      
       
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    N - Health Care 
       
      
         
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    N02 - Health Care Facilities, Manpower, 
      and Services 
      
      
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    SH - Science and Health 
       
      
         
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    SH1 - Health Sciences, Technology and 
      Innovation Management 
      
      
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    SP - Public Health 
       
      
         
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    SP1 - Health Policy, Planning and Management 
      
      SP2 - Health Care (Public Health) 
      
      SP5 - Epidemiology and Biostatistics 
      
      SP6 - Nutrition, Public Health 
      
      SP8 - Disasters 
      
      
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    VS - Health Surveillance 
       
      
         
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    VS2 - Health Surveillance of Products 
      
      VS3 - Health Surveillance of Health Services 
      
      
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    Z - Geographicals 
       
      
         
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    Z01 - Geographic Locations 
      
      
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