F. Adlbrecht and W. Hötzenecker declare that they have no relevant financial or non-financial interests with regard to the present manuscript to disclose. W. Hötzenecker is Editor-in-Chief of Allergo Journal and Allergo Journal International.

I. Angelova-Fischer has received travel support from Abbvie, ALK Abello, Pfizer, Sanofi and UCB Pharma and served on advisory boards for Galderma, Leo Pharma and Sanofi.