1. Department of Internal Medicine V, Ludwig-Maximilian University Munich, 81377 Munich, Germany
2. Comprehensive Pneumology Center (CPC-M), German Center for Lung Research, 81377 Munich, Germany
3. IBE—Institute for Medical Information Processing, Biometry and Epidemiology, Ludwig-Maximilian University, 81377 Munich, Germany
4. Department of Pneumology and Respiratory Medicine, Hospital Schillerhoehe, Academic Teaching Hospital of the University of Tuebingen, 70376 Gerlingen, Germany