1. University Children's Hospital Basel (UKBB) Basel Switzerland
2. Division of Pediatric Respiratory Medicine and Allergology Department of Pediatrics, Inselspital Bern University Hospital University of Bern Bern Switzerland
3. Swiss Tropical and Public Health Institute Basel Basel Switzerland
4. University of Basel Basel Switzerland
5. Institute of Primary Health Care (BIHAM) Bern Switzerland
6. Federal Office of Meteorology and Climatology MeteoSwiss Zurich Switzerland
7. Division of Respiratory Medicine University Children’s Hospital of Zurich Zurich Switzerland