1. Department of Dermatology; Peking University First Hospital; Beijing China
2. Beijing Key Laboratory of Molecular Diagnosis on Dermatoses; Beijing China
3. Department of Dermatology and Skin Science; University of British Columbia; Vancouver BC Canada
4. Department of Dermatology; Mudanjiang Medical University Hongqi Hospital; Mudanjiang Heilongjiang China
5. Central Laboratory; Peking University First Hospital; Beijing China