Yingyi Li1,2,3, Yang Wang1,2,4. 1. Department of Dermatology and Venerology, Peking University First Hospital, Beijing, China. 2. Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, Beijing, China. 3. National Clinical Research Center for Skin and Immune Diseases, Beijing, China. 4. National Clinical Research Center for Skin and Immune Diseases, Beijing, China. yangwang_dr@bjmu.edu.cn.