1. Department of Hematology, Beijing Friendship Hospital, Capital Medical University, Beijing, China;
2. Department of Transplatation, Affiliated Hospital Academy of Military Medical Sciences, Beijing, China;
3. Department of Hematology, Peking University First Hospital, Beijing, China;
4. Department of Hematology, Beijing Chao-yang Hospital, Capital Medical University, Beijing, China;
5. Department of Hematology, Peking University Third Hospital, Beijing, China; and
6. Department of Hematology, Navy General Hospital, Beijing, China