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