1. Department of Dermatology; University Hospital Jena; Erfurter Strasse 35 D-07743 Jena Germany
2. Department of Dermatology, Environmental Medicine, Health Theory; University of Osnabrück; Sedanstraße 115, 49069 Osnabrück Germany
3. Department of Social Medicine, Occupational and Environmental Dermatology; University of Heidelberg; Thibautstr. 3, 69115 Heidelberg Germany