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Subjects
- Abdomen -- surgery1
- Acne Vulgaris1
- Acquired Immunodeficiency Syndrome2
- Acquired Immunodeficiency Syndrome -- prevention & control14
- Acquired Immunodeficiency Syndrome -- transmission2
- Adolescent2
- Africa3
- Aged3
- Aircraft7
- Alaska3
- Alcohol Drinking1
- Alcoholics1
- Alcoholism1
- Ambulances8
- Amputees1
- Anemia, Sickle Cell1
- Anesthesia -- history1
- Animal Experimentation1
- Animal Husbandry1
- Animals, Laboratory1