2 Division of Dermatology, University of Louisville School of Medicine, Louisville, Kentucky.
3 Department of Dermatology and Allergy Centre, Odense University Hospital, and Dermatological Investigations Scandinavia, Department of Clinical Research, University of Southern Denmark, Odense, Denmark.
4 Department of Occupational and Environmental Dermatology, Lund University, Skåne University Hospital, Malmö, Sweden.