1. Department of International Health, Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark;
2. Division of Dermatology, McGill University Health Centre, Montréal, QC, Canada;
3. Department of Dermatology and Skin Science, University of British Columbia, Vancouver, BC, Canada;
4. Department of Dermatology and Venerology, Peking University First Hospital, Beijing, China;
5. Department of Dermatology, No.1 Hospital of China Medical University, Shenyang, China;
6. Department of Pathology, New York University Langone Medical Center, New York, NY; and
7. Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA