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- Toxicology
- Health aspects 44
- Environmental aspects 42
- Health risk assessment 27
- Physiological effect 19
- Environmental toxicology 18
- Pollution 17
- Agent Orange 14
- Veterans 14
- Vietnam War, 1961-1975 14
- Food additives 13
- Food 12
- Food contamination 12
- Drugs 11
- Environmental sciences 11
- Pesticides 10
- Safety measures 10
- Water 10
- Contamination 8
- Drinking water 8
- Ecotoxicology 8
- Environment 8
- Pharmacology/Toxicology 8
- Analysis 7
- Risk assessment 7
- Toxicity testing 7
- Dose-response relationship 6
- Environmental health 6
- Ionizing radiation 6
- Air 5
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