| http://www.w3.org/ns/prov#value | - In our primary care cohort, some of the patients may have been misclassified as having COPD, and complaints such as breathlessness and fatigue could have been caused by concealed ischemic heart disease or heart failure,8,25 diseases in which the mortality-reducing effects of ??-blockers are well established.9 It is possible that we could not completely correct for confounding by indication in that
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