1. Department of Dermatology, Nanfang Hospital, Southern Medical University, Guangzhou, P.R. China;
2. Department of Dermatology, Dongguan Sixth People’s Hospital, Dongguan, P.R. China;
3. Institute of Dermatology, Guangzhou Medical University, Guangzhou, P.R. China;
4. Department of Dermatology, Guangzhou Institute of Dermatology, Guangzhou, P.R. China