1. Departments of Dermatology & Medicine, University of Minnesota, Minneapolis, Minnesota, USA
2. Medical School, University of Minnesota, Minneapolis, Minnesota, USA
3. Department of Occupational and Environmental Dermatology, Lund University, Skåne University Hospital, Malmö, Sweden
4. Department of Dermatology, Park Nicollet Health Services, Minneapolis, Minnesota, USA
5. Department of Dermatology, University of Minnesota, Minneapolis, Minnesota, USA