1. Division of Dermatology, Department of Internal Medicine; The Ohio State University; Columbus OH 43221 USA
2. Department of Dermato-Allergology; Copenhagen University Hospital Gentofte, University of Copenhagen; DK-2900 Hellerup Denmark
3. Department of Dermatology; Loma Linda University School of Medicine; Loma Linda CA 92350 USA
4. Contact Dermatitis Institute; Phoenix AZ 85008 USA
5. Department of Experimental Dermatology and Cosmetology; Jagiellonian University Medical College; 31-008 Krakow Poland
6. Department of Dermatology; University of California at San Francisco; San Francisco CA 94115 USA
7. Institute of Environmental Medicine, Karolinska Institutet; SE-171 77 Stockholm Sweden
8. Department of Applied Environmental Science; Stockholm University; SE-106 91 Stockholm Sweden