1. Department of Dermatology and Allergology, Hannover Medical School; Germany
2. Clinic for Dermatology, Venereology and Allergology, University Clinic Schleswig-Holstein; Campus Kiel; Germany
3. Clinic for Dermatology, Venereology and Allergology, Charité -; University Medicine Berlin; Germany
4. Clinic and Polyclinic for Dermatology and Allergology, University Clinic Munich (LMU); Germany
5. University Clinic for Dermatology; Tübingen; Germany
6. Clinic and Polyclinic for Dermatology, Venereology and Allergology; University Clinic Würzburg; Germany