Peiqiu Zhu1, Yang Wang2. 1. Department of Dermatology and Venereology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, Beijing, China. 2. Department of Dermatology and Venereology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, Beijing, China. Electronic address: yangwang_dr@bjmu.edu.cn.