1 Harvard Medical School, Boston, Massachusetts; Department of Dermatology, Brigham and Women's Hospital, Boston, Massachusetts.
2 Department of Dermatology, Penn State Hershey Medical Center, Penn State University, Hershey, Pennsylvania; Department of Pediatrics, Penn State Children's Hospital, Hershey, Pennsylvania.
3 Department of Dermatology, Brigham and Women's Hospital, Boston, Massachusetts. Electronic address: jbarbieri@bwh.harvard.edu.