1. Department of General Practice, University Medical Centre Goettingen, Goettingen, Germany
2. Department of General Practice, University Medical Centre Wuerzburg, Wuerzburg, Germany
3. Department for Pediatrics, Hannover Medical School, Hannover, Germany
4. Department of Paediatric Pneumology, Allergology, and Neonatology, Hannover Medical School, Hannover, Germany
5. German Centre for Lung Research, Biomedical Research in End Stage and Obstructive Lung Disease/ BREATH, Hannover, Germany
6. German Centre for Infection Research (DZIF), Partner Site Hannover-Brunswick, Braunschweig, Germany
7. Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany