1. From the *Division of Dermatology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Canada;
2. Division of Occupational Health, Unity Health Toronto, St. Michael's Hospital, Toronto, Canada;
3. Department of Dermatology, Park Nicollet/Health Partners 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. Department of Dermatology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA;
7. Department of Dermatology, Duke University Medical Center, Durham, North Carolina, USA;
8. Department of Dermatology, The George Washington University School of Medicine and Health Sciences, Washington, District of Columbia, USA;
9. Department of Dermatology, Columbia University Irving Medical College, New York, New York, USA;
10. Division of Dermatology, McGill University Health Centre, Montréal, Canada;
11. Department of Dermatology, Geisel School of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, Nebraska, USA;
12. Department of Dermatology, Cleveland Clinic, Cleveland, Ohio, USA;
13. Division of Dermatology, University of Ottawa, Ottawa, Canada;
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, Keck School of Medicine, University of Southern California, Los Angeles, California, USA;
17. Division of Dermatology, Centre Hospitalier Universitaire de Québec, Laval University, Québec, Canada;
18. Division of Dermatology, Geisinger Medical Center, Danville, Pennsylvania, USA;
19. Department of Dermatology, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts, USA;
20. Department of Dermatology, University of Colorado, Aurora, Colorado, USA.