Han Ma1,2, Yaqin Zhang3,2. 1. Department of Dermatology, Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China. 2. Guangdong Provincial Key Laboratory of Biomedical Imaging, Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, China. 3. Department of Radiology, Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China zhyaqin@mail.sysu.edu.cn.