| A - Anatomy 
 
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| | A02 - Musculoskeletal System 
 A06 - Endocrine System
 
 A08 - Nervous System
 
 A11 - Cells
 
 
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| B - Organisms 
 
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| | B01 - Eukaryota 
 B03 - Bacteria
 
 B04 - Viruses
 
 
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| C - Diseases 
 
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| | C02 - Virus Diseases 
 C04 - Neoplasms
 
 C05 - Musculoskeletal Diseases
 
 C06 - Digestive System Diseases
 
 C07 - Stomatognathic Diseases
 
 C08 - Respiratory Tract Diseases
 
 C09 - Otorhinolaryngologic Diseases
 
 C10 - Nervous System Diseases
 
 C11 - Eye Diseases
 
 C12 - Male Urogenital Diseases
 
 C13 - Female Urogenital Diseases and Pregnancy Complications
 
 C14 - Cardiovascular Diseases
 
 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 - Chemically-Induced Disorders
 
 C26 - Wounds and Injuries
 
 
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| D - Chemicals and Drugs 
 
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| | D02 - Organic Chemicals 
 D03 - Heterocyclic Compounds
 
 D05 - Macromolecular Substances
 
 D06 - Hormones, Hormone Substitutes, and Hormone Antagonists
 
 D08 - Enzymes and Coenzymes
 
 D09 - Carbohydrates
 
 D12 - Amino Acids, Peptides, and Proteins
 
 D20 - Complex Mixtures
 
 D23 - Biological Factors
 
 D25 - Biomedical and Dental Materials
 
 D26 - Pharmaceutical Preparations
 
 D27 - Chemical Actions and Uses
 
 
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| E - Analytical, Diagnostic and Therapeutic Techniques and Equipment 
 
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| | E01 - Diagnosis 
 E02 - Therapeutics
 
 E03 - Anesthesia and Analgesia
 
 E04 - Surgical Procedures, Operative
 
 E05 - Investigative Techniques
 
 E07 - Equipment and Supplies
 
 
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| F - Psychiatry and Psychology 
 
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| | F01 - Behavior and Behavior Mechanisms 
 F02 - Psychological Phenomena and Processes
 
 F03 - Mental Disorders
 
 F04 - Behavioral Disciplines and Activities
 
 
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| G - Phenomena and Processes 
 
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| | G01 - Physical Phenomena 
 G02 - Chemical Phenomena
 
 G03 - Metabolic Phenomena
 
 G04 - Cell Physiological Phenomena
 
 G05 - Genetic Phenomena
 
 G07 - Physiological Phenomena
 
 G08 - Reproductive and Urinary Physiological Phenomena
 
 G09 - Circulatory and Respiratory Physiological Phenomena
 
 G10 - Digestive System and Oral Physiological Phenomena
 
 G11 - Musculoskeletal and Neural Physiological Phenomena
 
 G13 - Integumentary System Physiological Phenomena
 
 G14 - Ocular Physiological Phenomena
 
 G16 - Biological Phenomena
 
 
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| H - Disciplines and Occupations 
 
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| | H01 - Natural Science Disciplines 
 H02 - Health Occupations
 
 
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| I - Anthropology, Education, Sociology and Social Phenomena 
 
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| | I01 - Social Sciences 
 I03 - Human Activities
 
 
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| J - Technology, Industry, Agriculture 
 
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| | J01 - Technology, Industry, and Agriculture 
 J02 - Food and Beverages
 
 
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| L - Information Science 
 
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| | L01 - Information Science 
 
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| M - Named Groups 
 
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| N - Health Care 
 
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| | N02 - Health Care Facilities, Manpower, and Services 
 N03 - Health Care Economics and Organizations
 
 N04 - Health Services Administration
 
 N05 - Health Care Quality, Access, and Evaluation
 
 N06 - Environment and Public Health
 
 
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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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| | SP2 - Health Care (Public Health) 
 SP4 - Environmental Health
 
 SP8 - Disasters
 
 
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| VS - Health Surveillance 
 
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| | VS2 - Health Surveillance of Products 
 
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| Z - Geographicals 
 
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| | Z01 - Geographic Locations 
 
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