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1 Department of Dermatology and Cutaneous Biology and the Jefferson Center for International Dermatology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, PA; larryderm@yahoo.com.
2 Department of Dermatology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA.
3 Queen's University Belfast, Belfast, Northern Ireland.
1 Department of Dermatology and Cutaneous Biology and the Jefferson Center for International Dermatology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, PA; larryderm@yahoo.com.
2 Department of Dermatology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA.
3 Queen's University Belfast, Belfast, Northern Ireland.