No abstract available
MeSH terms
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Asthma / drug therapy
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Asthma / epidemiology
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Asthma / mortality*
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Bias
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Case-Control Studies
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Confounding Factors, Epidemiologic
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Fenoterol / adverse effects*
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Hospitalization / statistics & numerical data
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Humans
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Legislation, Drug*
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New Zealand / epidemiology
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Risk Factors
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Severity of Illness Index