1. Hautzentrum Köln (Cologne Dermatology); Köln Germany
2. Centre for Clinical Studies; University Hospital Regensburg; Regensburg Germany
3. Biofrontera Pharma GmbH; Leverkusen Germany
4. Professional Association of German Dermatologists (BVDD); Mönchengladbach Germany
5. Hautarztpraxis am Löwenmarkt; Dematology Practice; Stuttgart Germany
6. Hautarztpraxis Dr. med. Urte Hammann; Dermatology Practice; Stade Germany
7. Hautarztpraxis Dr. med. J. W. Glutsch; Dermatology Practice; Karlsruhe Germany
8. Hautzentrum Donau Alb; Dermatology Practice; Blaubeuren Germany
9. Department of Dermatology and Allergology; Vest Clinic; Recklinghausen Germany