No abstract available
MeSH terms
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Adult
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Age Factors
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Arrhythmias, Cardiac / epidemiology
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Coronary Disease / diagnosis*
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Coronary Disease / epidemiology
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Coronary Disease / mortality
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Electrocardiography*
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Europe
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Exercise Test
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Humans
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Male
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Middle Aged
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Occupations
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Prognosis
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Railroads
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Sex Factors
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United States