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. Department of Dermatology, University of Wisconsin Hospitals and Clinics, Madison, WI, USA
5. Division of Dermatology, Sunnybrook Health Sciences Center, University of Toronto, Ontario, Canada
6. Department of Dermatology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
7. Division of Dermatology, University of Ottawa, Ontario, Canada
8. Department of Dermatology, Columbia University Irving Medical School, New York, New York, USA
9. Department of Dermatology, Duke University Medical Center, Durham, North Carolina, USA
10. Division of Dermatology, Centre Hospitalier Universitaire de Québec, Laval University, Québec, Canada
11. Department of Dermatology, Rocky Mountain Regional VAMC, Aurora, Colorado, USA
12. Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
13. Department of Dermatology, Cleveland Clinic, Cleveland, Ohio, USA
14. Department of Dermatology, The George Washington University School of Medicine and Health Sciences, Washington, DC, USA
15. Department of Dermatology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
16. Department of Dermatology, Geisinger Medical Center, Danville, Pennsylvania, USA
17. Department of Dermatology, University of California San Francisco, San Francisco, California, USA