Characteristics of Current Smokers versus Former Smokers with COPD and Their Associations with Smoking Cessation Within 4.5 Years: Results from COSYCONET by Alter P, Stoleriu C, Kahnert K, Henke MO, Bals R, Trudzinski FC, Watz H, Speicher T, Söhler S, Welte T, Rabe KF, Wouters EFM, Vogelmeier CF, Jörres RA

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