1. Department of Dermatology; Beijing Tsinghua Changgung Hospital; Medical Center; Tsinghua University; No. 168 Litang Road Dongxiaokou Town Changping District Beijing 102218 China
2. Department of Dermatology and Venereology; Peking University First Hospital; No. 8 Xishiku Street Xicheng District Beijing 100034 China
3. Department of Dermatology; Xijing Hospital; Fourth Military Medical University; Xi'an 710032 China
4. Department of Dermatology; Civil Aviation General Hospital; No. 1 Chaowai Gaojiajin Beijing 100123 China