1. Department of Dermatology; No. 1 Hospital of China Medical University; 155 N. Nanjing Street Shenyang 110001 China
2. Department of Dermatology; Nanshan District People's Hospital Affiliated to Guangdong Medical College; Shenzhen 518052 China
3. Cardiff Institute of Tissue Engineering and Repair; Cardiff University; Cardiff CF14 4XY U.K