1. From the Department of Dermatology, George Washington University School of Medicine, Washington, DC
2. Department of Dermatology, Northwestern University Feinberg School of Medicine, Chicago, IL
3. Department of Dermatology, George Washington University School of Medicine, Washington, DC
4. Department of Dermatology, Park Nicollet Health Services
5. Department of Dermatology, University of Minnesota
6. Department of Dermatology, Minneapolis Veterans Affairs Medical Center, MN
7. Division of Dermatology, Sunnybrook Health Sciences Centre, University of Toronto, Canada
8. Department of Dermatology, Columbia University Irving Medical Center, New York, NY
9. Department of Dermatology, Duke University Medical Center, Durham, NC
10. Department of Dermatology, Cleveland Clinic, OH
11. Division of Dermatology, Montreal General Hospital, McGill University, Montreal, Canada
12. Department of Dermatology, University of Wisconsin School of Medicine and Public Health, Madison
13. Division of Dermatology, Centre Hospitalier Universitaire (CHU) de Québec, Laval University, Canada
14. Department of Dermatology, Keck School of Medicine, Los Angeles
15. Department of Dermatology, University of California San Francisco
16. Division of Dermatology University of Louisville, KY
17. Department of Dermatology, Dartmouth-Hitchcock Medical Center, Lebanon, NH
18. Division of Dermatology, University of Ottawa, Canada.