Chronic obstructive pulmonary disease in older persons: A comparison of two spirometric definitions
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PII: S0954-6111(10)00048-X
doi:10.1016/j.rmed.2009.10.030
Published by Elsevier Inc.
PII: S0954-6111(10)00048-X
doi:10.1016/j.rmed.2009.10.030
Published by Elsevier Inc.