1. Department of Dermatology, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts
2. Department of Dermatology, Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts
3. Division of Pediatric Pathology, Department of Pathology and Laboratory Medicine, Children's Hospital of Wisconsin, Medical College of Wisconsin, Milwaukee, Wisconsin
4. Department of Dermatology and Pathology, Harvard Medical School, Boston, Massachusetts