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Wacker, Margarethe E., Matthias Hunger, Stefan Karrasch, Joachim Heinrich, Annette Peters, Holger Schulz, and Rolf Holle. Health-related Quality of Life and Chronic Obstructive Pulmonary Disease in Early Stages – Longitudinal Results From the Population-based KORA Cohort in a Working Age Population. BioMed Central, 2014.

Wacker, Margarethe E., et al. Health-related Quality of Life and Chronic Obstructive Pulmonary Disease in Early Stages – Longitudinal Results From the Population-based KORA Cohort in a Working Age Population. BioMed Central, 2014.