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Correspondence to Dr Nick H T ten Hacken; n.h.t.ten.hacken@umcg.nl ABSTRACT Introduction: Chronic obstructive pulmonary disease (COPD) is a heterogeneous disease with pulmonary and extra-pulmonary(More)
INTRODUCTION Chronic obstructive pulmonary disease (COPD) is a heterogeneous disease with pulmonary and extra-pulmonary manifestations. Although COPD is a complex disease, diagnosis and staging are(More)