Peking University Institute of Hematology, Peking University People's Hospital, Beijing, China; National Clinical Research Center for Hematologic Disease, Beijing, China; Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China; Collaborative Innovation Center of Hematology, Peking University, Beijing, China. Department of Hematology, The Sixth Medical Center of PLA General Hospital, Beijing, China. Department of Hematology, Beijing Aerospace General Hospital, Beijing, China. Department of Hematology, Qilu Hospital, Shandong University, Jinan, China. Department of Hematology, National Centre of Gerontology, Beijing Hospital, Beijing, China. Department of Hematology, Beijing Tongren Hospital, Beijing, China. Biological Information and Statistics Center, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China; National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. Peking University Institute of Hematology, Peking University People's Hospital, Beijing, China; National Clinical Research Center for Hematologic Disease, Beijing, China; Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China; Collaborative Innovation Center of Hematology, Peking University, Beijing, China. Electronic address: zhangxh@bjmu.edu.cn.