1 Department of Dermatology, Peking Union Medical College Hospital, State Key Laboratory of Complex Severe and Rare Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, National Clinical Research Center for Skin and Immune Diseases, No.1, Shuaifuyuan, Dongcheng District, Beijing, 100730, PR China.
2 Department of Dermatology, Peking Union Medical College Hospital, State Key Laboratory of Complex Severe and Rare Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, National Clinical Research Center for Skin and Immune Diseases, No.1, Shuaifuyuan, Dongcheng District, Beijing, 100730, PR China. mdonglai@sohu.com.