1. From the Department of Dermatology, George Washington University School of Medicine, Washington, District of Columbia, USA;
2. Department of Dermatology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA;
3. Department of Dermatology, Park Nicollet Health Services, Minneapolis, Minnesota, USA;
4. Department of Dermatology, University of Minnesota, Minneapolis, Minnesota, USA;
5. Department of Dermatology, Minneapolis Veterans Affairs Medical Center, Minneapolis, Minnesota, USA;
6. Division of Dermatology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Canada.
7. Department of Dermatology, Columbia University Irving Medical Center, New York, New York, USA.
8. Department of Dermatology, Duke University Medical Center, Durham, North Carolina, USA;
9. Department of Dermatology, Cleveland Clinic, Cleveland, Ohio, USA;
10. Division of Dermatology, Montreal General Hospital, McGill University, Montreal, Canada;
11. Department of Dermatology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA;
12. Division of Dermatology, Centre Hospitalier Universitaire (CHU) de Québec, Laval University, Quebec, Canada;
13. Department of Dermatology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA;
14. Department of Dermatology, University of California San Francisco, San Francisco, California, USA.
15. Division of Dermatology, University of Louisville, Louisville, Kentucky, USA;
16. Department of Dermatology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA;
17. Division of Dermatology, University of Ottawa, Ottawa, Canada;
18. Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA;
19. Division of Dermatology, Geisinger Health System, Danville, Pennsylvania, USA; and
20. Department of Dermatology, University of Southern California, Lost Angeles, California, USA.