Chronic respiratory symptoms, spirometry and knowledge of COPD among general population
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PII: S0954-6111(06)00109-0
doi:10.1016/j.rmed.2006.02.024
© 2006 Elsevier Ltd. All rights reserved.
PII: S0954-6111(06)00109-0
doi:10.1016/j.rmed.2006.02.024
© 2006 Elsevier Ltd. All rights reserved.