1. Department of Medical Informatics, Biometry and Epidemiology; Friedrich-Alexander-University Erlangen/Nürnberg; D-91054 Erlangen Germany
2. Department of Dermatology; Faculty of Medicine, University Hospital, University of Coimbra; Praceta Mota Pinto P-300-075 Coimbra Portugal
3. Department of Occupational and Environmental Dermatology; Institute of Environmental Medicine, Karolinska Institutet; SE-171 77 Stockholm Sweden
4. Department for Cosmetics and Medicinal Products; Chemical and Veterinary Investigation Office (CVUA Karlsruhe); D-76187 Karlsruhe Germany