1. Department of Dermatology; Chapel Allerton Hospital; Leeds LS7 4SA UK
2. Department of Medical Informatics, Biometry and Epidemiology; University of Erlangen/Nürnberg; 91054 Erlangen Germany
3. Information Network of Departments of Dermatology (IVDK); University Medical Centre; 37075 Goettingen Germany
4. Department of Experimental Dermatology and Cosmetology; Jagiellonian University Medical College; 30-688 Krakow Poland
5. Department of Dermatology; University Hospital of Erlangen; 91054 Erlangen Germany
6. Department of Occupational Diseases, Centre Hôtel-Dieu, AP-HP; Paris University Hospital; 75004 Paris France
7. Department of Dermatology; University Medical Centre Groningen, University of Groningen; 9713 GZ Groningen The Netherlands
8. Department of Dermatology, University Allergy Centre, University Hospital Carl Gustav Carus; Technical University Dresden; 01307 Dresden Germany