From the Department of Dermatology, The Eastern Hospital of The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.
The authors report no conflict of interest.
Correspondence: Di-Qing Luo, MMS, Department of Dermatology, The Eastern Hospital of the First Affiliated Hospital, Sun Yat-sen University, 183 Huangpu Rd E, Guangzhou 510700, China (luodq@mail.sysu.edu.cn).