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Technological changes in societies give rise to changing patterns of illness in populations. Shifts from farming, hunting and gathering, and reliance on walking or use of animals for transportation to mechanized modes of industry, communications, and transportation have been accompanied by a shift from the prominence of infectious diseases to the prominence of injuries and chronic illnesses. Innovation in medical technology has paralleled and often surpassed advances in the methods of manufacturing and production of goods in developed societies. Improvements in the way we diagnose diseases, identify their etiologic pathways, and develop methods of prevention also have profound effects on
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