1 Department of Dermatology, Massachusetts General Hospital, Boston, Mass.
2 Department of Dermatology, Massachusetts General Hospital, Boston, Mass; Harvard Medical School, Boston, Mass.
3 Harvard Medical School, Boston, Mass; Department of Pathology, Massachusetts General Hospital; Boston, Mass.
4 Department of Dermatology, Massachusetts General Hospital, Boston, Mass; Harvard Medical School, Boston, Mass. Electronic address: dkroshinsky@mgh.harvard.edu.