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