How often is diagnosis of COPD confirmed with spirometry?
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PII: S0954-6111(09)00358-8
doi:10.1016/j.rmed.2009.10.023
© 2009 Elsevier Ltd. All rights reserved.
PII: S0954-6111(09)00358-8
doi:10.1016/j.rmed.2009.10.023
© 2009 Elsevier Ltd. All rights reserved.