Wei Wang1, Jian Sun2, Wei Zhang3, Daobin Zhou1. 1. Department of Hematology, Peking Union Medical College Hospital, No.1 Shuaifuyuan street, Dongcheng district, Beijing, 100730, China. 2. Department of Pathology, Peking Union Medical College Hospital, Beijing, China. 3. Department of Hematology, Peking Union Medical College Hospital, No.1 Shuaifuyuan street, Dongcheng district, Beijing, 100730, China. vv1223@vip.sina.com.