Ying Shan1,2, Ya-Gang Zuo1. 1. Department of Dermatology, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, China. 2. Department of Dermatology, Hebei North University, Zhangjiakou, Hebei, China.