1. Division of Dermatology, Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA.
2. Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA.
3. Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
4. Department of Dermatology and Skin Science, University of British Columbia, Vancouver, British Columbia V5Z 4E8, Canada.
5. Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.