1 Duke University School of Medicine, Durham, North Carolina, USA.
2 Universidad Central del Caribe School of Medicine, Bayamón, Puerto Rico; Department of Dermatology, Brigham and Women's Hospital, Boston, Massachusetts, USA.
3 Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
4 Harvard Medical School, Shattuck Street, Boston, Massachusetts, USA; Department of Dermatology, Brigham and Women's Hospital, Boston, Massachusetts, USA.