1. Department of Clinical and Experimental Occupational Dermatology; Institute for Prevention and Occupational Medicine of the German Occupational Accident Insurance, Institute of the Ruhr University Bochum (IPA); Germany
2. Department of Clinical Social Medicine, Occupational and Environmental Dermatology; Ruprecht Karls University Heidelberg; Germany
3. Institute and Outpatient Clinic for Occupational, Social, and Environmental Medicine; University of Erlangen-Nuremberg; Germany
4. Department of Dermatology; University Hospital Jena; Germany
5. Department of Dermatology, Environmental Medicine; Health Theory, University of Osnabrueck; Germany