No abstract available
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Africa
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Age Factors
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Asia
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Asthma / epidemiology*
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Asthma / etiology
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Cross-Sectional Studies
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England
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Epidemiologic Methods
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Europe
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Histamine
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Humans
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Methacholine Chloride
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Methacholine Compounds
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North America
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Rural Population
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Urban Population
Substances
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Methacholine Compounds
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Methacholine Chloride
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Histamine