1. From the Department of Dermatology, Park Nicollet/Health Partners Health Services, Minneapolis, Minnesota, USA.
2. Department of Dermatology, University of Minnesota Medical School, Minneapolis, Minnesota, USA.
3. Department of Dermatology, Minneapolis Veterans Affairs Medical Center, Minneapolis, Minnesota, USA.
4. University of Minnesota Medical School, Minneapolis, Minnesota, USA.
5. Department of Dermatology, Duke University Medical Center, Durham, North Carolina, USA.
6. Division of Dermatology, Sunnybrook Health Sciences Centre, University of Toronto, Ontario, Canada.
7. Division of Dermatology, University of Ottawa, Ontario, Canada.
8. Department of Dermatology, Cleveland Clinic, Cleveland, Ohio, USA.
9. Department of Dermatology, Columbia University Irving Medical School, New York, New York, USA.
10. Department of Dermatology, The George Washington University School of Medicine and Health Sciences, Washington, District of Columbia, USA.
11. Department of Dermatology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA.
12. Department of Dermatology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
13. Division of Dermatology, Centre Hospitalier Universitaire de Québec, Laval University, Québec, Canada.
14. Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA.
15. Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.
16. Department of Dermatology, Geisinger Medical Center, Danville, Pennsylvania, USA.
17. Department of Dermatology, University of California San Francisco, San Francisco, California, USA.