1. Department of Venereology and Dermatology; Otto-von-Guericke University Magdeburg; Germany
2. Dermatologist in private practice Oranienburg; Germany
3. Dermatologist in private practice Freiburg; Germany
4. Dermatologist in private practice Berlin; Germany
5. Dermatologist in private practice Lippstadt; Germany
6. Dermatologist in private practice Buchholz in der Nordheide; Germany
7. med:unit GmbH; Köln Germany
8. Galderma Laboratorium GmbH; Düsseldorf Germany