1. Pediatric Skin Center Dermatology Department University Children's Hospital Zurich Zurich Switzerland
2. Department of Dermatology, Inselspital Bern University Hospital University of Bern Bern Switzerland
3. Department of Dermatology University Hospital Zurich Zurich Switzerland
4. Christine Kühne Center for Allergy Research and Education CK‐CARE Davos Switzerland
5. Division of Oncology and Hematology University Children's Hospital Zurich Zurich Switzerland