1. Department of Dermatology and Allergy; University Hospital Charité; Berlin; Germany
2. edenharter research; Berlin; Germany
3. Department of Dermatology and Allergology; Ludwig-Maximilian-University; Munich; Germany
4. Allergy Unit; Department of Dermatology; University Hospital; Basel; Switzerland
5. Department of Dermatology; Saarland University Hospital; Homburg/Saar; Germany
6. Department of Dermatology; University Hospital; Erlangen; Germany
7. Department of Dermatology; Venerology and Allergology, Universität Leipzig; Germany
8. Department of Dermatology; University Hospital; Paracelsus Medical University; Salzburg; Austria
9. Department of Paediatrics; University Hospital Carl Gustav Carus; Technical University of Dresden; Dresden; Germany
10. Division of Allergy; University Children's Hospital; Zurich; Switzerland
11. Paediatric Allergology and Pneumology; German Red Cross Hospital Westend; Berlin; Germany