Health aspects Environmental aspects 129 Social aspects 113 Pollution 80 Toxicology 80 Health and hygiene 79 History 75 more ... Medical care 66 Health risk assessment 65 Veterans 64 Prevention 63 Public health 61 Diseases 56 Equality 56 Research 56 Environmental health 54 Safety measures 50 Health services accessibility 43 Government policy 42 Persian Gulf War, 1991 41 Medical policy 38 Physiological effect 37 Air 36 Health 35 Smoking 34 Risk assessment 33 Contamination 30 Water 30 Climatic changes 29 Drinking water 29 less ...