1. Department of Dermatology, University of Pennsylvania, PA, USA
2. Department of Biostatistics and Epidemiology, University of Pennsylvania, Philadelphia, PA, USA
3. Department of Dermatology, Yale Medical School, New Haven, CT, USA
4. Division of Dermatology, Department of Medicine, University of Louisville, Lousiville, KY, USA
5. Department of Dermatology, Southwestern Medical School, Dallas, TX, USA
6. Division of Dermatology, University of British Columbia, Vancouver, Canada
7. Private Practice, Ann Arbor, MI, USA
8. Department of Dermatology, NYU Medical Center, New York, NY, USA
9. Department of Dermatology, Bowman Gray School of Medicine, Winston-Salem, NC, USA
10. Dermatology Service, Department of Medicine, Denver Health Medical Center, Denver, CO, USA, Departments of Dermatology and Medicine, University of Colorado School of Medicine, Denver, CO, USA
11. Private Practice, Rutland, VT, USA
12. Department of Dermatology, University of Iowa, Iowa City, IO, USA
13. Department of Dermatology, University of Pennsylvania, PA, USA, Dermatology Service, Veterans Hospital Philadelphia, Philadelphia, PA, USA,