Affiliation: | 1. Competence Center Health Services Research in Dermatology – CVderm‐, Institute for Health Services Research in Dermatology and Nursing–IVDP, University Clinics, , Hamburg Eppendorf, Germany;2. Dermatology practice, , Tibarg, Hamburg, Germany;3. Joint practice dermatology/allergology, , M?nchengladbach, Germany |