1. Department of Dermatology; Erasmus MC University Medical Center Rotterdam and KinderHaven Havenziekenhuis; Rotterdam; The Netherlands
2. Department of Dermatology and Allergy Centre; Odense University Hospital; University of Southern Denmark; Odense; Denmark
3. Department Of Dermatology and Allergy Biederstein; Technische Universität München; ZAUM-Center foor Allergy and Environment; Munich; Germany
4. Department of Dermatology & Allergy; Amersham Hopital Whielden Street; Amersham Bucks; UK
5. Department of Dermatology and Allergy; Charité - Universitaetsmedizin Berlin; Berlin; Germany
6. Department of Pediatrics; Padua General University Hospital; Padua; Italy
7. Department of Dermatology; Allergy Unit; University of Zürich; Zürich; Switzerland
8. Department of Dermatology; University of Barcelona; Barcelona; Spain
9. Department of Experimental Dermatology and Cosmetology; Jagiellonian University Medical College; Krakow; Poland
10. Faculty of Medicine Clinic of Children's Diseases; Vilnius University Children Hospital; Vilnius; Lithuania
11. Department of Paediatric Dermatology & Allergy; St John's Institute of Dermatology; Guy's and St Thomas' Hospital NHS Foundation Trust and King's College London; London; UK
12. Department of Pediatrics; Odense University Hospital; Odense; Denmark
13. Division of Allergy; Pediatric Hospital Bambino Gesù; Rome, Vatican City; 00165; Italy
14. Department of Allergology/Immunology; Hospital CUF Descobertas; Lisbon; Portugal
15. Departments of Dermatology and Pediatrics; Erasmus MC-Sophia Children's Hospital and KinderHaven Havenziekenhuis; Maasstad Ziekenhuis Rotterdam; The Netherlands