Preselection of patients at risk for COPD by two simple screening questions
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PII: S0954-6111(10)00012-0
doi:10.1016/j.rmed.2010.01.005
© 2010 Elsevier Ltd. All rights reserved.
PII: S0954-6111(10)00012-0
doi:10.1016/j.rmed.2010.01.005
© 2010 Elsevier Ltd. All rights reserved.