The German COPD cohort COSYCONET: Aims, methods and descriptive analysis of the study population at baseline - Karch, Annika; Vogelmeier, Claus; Welte, Tobias; Bals, Robert; Kauczor, Hans-Ulrich; Biederer, Jürgen; Heinrich, Joachim; Schulz, Holger; Gläser, Sven; Holle, Rolf; Watz, Henrik; Korn, Stephanie; et al. (Respiratory medicine, 2016)
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