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