1. Department of General Practice, University Medical Center, Goettingen, Germany
2. Department of Geriatrics, University Medical Center, Göttingen, Germany
3. Department of Family Medicine, MI State University, Grand Rapids, MI, USA
4. Department of Rheumatology and Immunology, Hannover Medical School, Germany
5. Department of Pediatric Pulmonology, Allergology and Neonatology, Hannover, Germany
6. Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Germany
7. German Center for Infection Research, Site Hannover-Braunschweig, Hannover, Germany
8. Faculty of Social Work and Health, University of Applied Sciences and Arts Hildesheim, Germany