Xin-Xin Cao1, Tao Wang2, Yue-Hua Liu2, Dao-Bin Zhou1, Jian Li1. 1. a Department of Hematology , Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing , China. 2. b Department of Dermatology , Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing , China.