Unravelling the Information Contained in the Single Items of the COPD Assessment Test for Different Outcomes and Smoking Status in Patients with COPD: Results from COSYCONET by Alter P, Kahnert K, Trudzinski FC, Bals R, Watz H, Speicher T, Söhler S, Rabe KF, Wouters EFM, Vogelmeier CF, Jörres RA

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