No abstract available
MeSH terms
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Aged
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Airway Obstruction / epidemiology
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Bronchial Diseases / epidemiology
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Cardiomegaly / epidemiology
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Cough / epidemiology
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Dyspnea / epidemiology
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Electrocardiography
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Female
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Heart Failure / epidemiology
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Humans
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Lung Diseases, Obstructive / chemically induced
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Lung Diseases, Obstructive / diagnostic imaging
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Lung Diseases, Obstructive / epidemiology*
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Male
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Middle Aged
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Opium*
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Pleural Diseases / epidemiology
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Pulmonary Emphysema / epidemiology
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Radiography
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Respiratory Function Tests
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Singapore
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Smoking / complications*
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Substance-Related Disorders / complications*