1. Peking University Peoples Hospital Peking University Institute of Hematology Beijing 100044 P. R. China
2. National Clinical Research Center for Hematologic Disease Beijing 100044 P. R. China
3. Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation Beijing 100044 P. R. China
4. Peking‐Tsinghua Center for Life Science Beijing 100044 P. R. China