1 Division of Pediatric Respiratory Medicine and Allergology, Department of Pediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
2 Graduate School for Health Sciences, University of Bern, Bern, Switzerland.
3 Institute of Primary Health Care (BIHAM), University of Bern, Bern, Switzerland.
4 Graduate School for Biomedical Science, University of Bern, Bern, Switzerland.
5 University Children's Hospital Basel (UKBB), Basel, Switzerland.
6 Allergology, Department of Medicine, Lucerne Cantonal Hospital and University of Lucerne, Lucerne, Switzerland.
7 Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.