1. Department of Pediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
2. Department of Pediatric Emergency Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
3. Institute for Infectious Diseases, University of Bern, Bern, Switzerland
4. Airway Research Center North (ARCN), Member of the German Lung Research Center (DZL), University of Luebeck, Luebeck, Germany