1. Department of Dermatology; University Hospital; Erlangen
2. Department of Clinical Social Medicine; University Hospital; Heidelberg
3. Dermatology, Environmental Medicine and Health Theory Section; University of Osnabrück
4. Department of Dermatology; University of Mainz
5. Department of Dermatology; University of Bochum
6. Institute for Prevention and Occupational Medicine of the German Statutory Accident Insurance; Institute of the Ruhr University Bochum
7. Information Network of Dermatology Departments; University of Göttingen
8. Dermatologist in private practice; Künzelsau
9. Department of Dermatology; University of Essen
10. German Statutory Accident Insurance; Berlin
11. Department of Dermatology; University of Hannover