1 Department of Dermatology and Venereology, Sun Yat-sen Memorial Hospital of Sun Yat-Sen University, 107 West Yanjiang Road, Guangzhou, China.
2 Department of Dermatology and Venereology, Sun Yat-sen Memorial Hospital of Sun Yat-Sen University, 107 West Yanjiang Road, Guangzhou, China. lush7@mail.sysu.edu.cn.