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- Safety measures
- Prevention 59
- Food 43
- Radiation 26
- Health aspects 22
- Aeronautics 20
- Environmental aspects 20
- Security measures 20
- Government policy 18
- Management 18
- Chemicals 17
- Food industry and trade 17
- Medical errors 17
- Medical care 15
- Design and construction 14
- Industrial safety 13
- Emergency management 12
- Food adulteration and inspection 12
- Health and hygiene 12
- Law and legislation 12
- Quality control 12
- Transportation 12
- Hazardous substances 11
- Patients 11
- Libraries 10
- Nuclear power plants 10
- Toxicology 10
- Drugs 9
- Evaluation 9
- Planning 9
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