1. Division of Paediatric Respiratory Medicine and Allergology, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
2. Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.
3. Institute of Applied Physics, University of Bern, Bern, Switzerland.
4. Institute of Anatomy, University of Bern, Bern, Switzerland.