1. Department of Dermatology and Allergy; Ludwig-Maximilian-University; Munich Germany
2. Department of Dermatology (Pediatric Dermatology and Hair); Dermicis Skin clinic; Alkmaar and Rotterdam The Netherlands
3. Department of Dermatology; Aarhus University Hospital; Aarhus Denmark
4. Department of Dermatology; Inselspital; Bern University Hospital; University of Bern; Bern Switzerland
5. Heim Pal Childrens Hospital; Budapest Hungary
6. Dermatologikum; Hamburg Germany
7. Department of Dermatology; University Hospital UMAS; Malmö Sweden
8. Department of Dermatology; University of Nantes; Nantes France
9. Service de Dermatologie et Dermatologie Pédiatrique; Centre de référence pour les maladies rares de la peau; INSERM 1035; Université de Bordeaux; Talence France
10. Department of Dermatology; University of Utrecht; Utrecht The Netherlands
11. Department of Dermatology; Hautklinik Linden; MHH; Hannover Germany
12. Department of Dermatology, Venereology and Allergology; Medical University of Gdansk; Gdansk Poland
13. Department of Dermatology and Allergy Biederstein; Technische Universität München; Munich Germany
14. Christine Kühne Center for Allergy Research and Education (CK-CARE); Davos Switzerland
15. ZAUM - Center of Allergy & Environment; Munich Germany