Department of Hematology, Peking University People's Hospital, Beijing, China. Department of Hematology, First Affiliated Hospital of Soochow University, Suzhou, China. Department of Hematology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China. Department of Hematology, Xinqiao Hospital, Army Medical University, Chongqing, China. Department of Hematology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China. Harbin Institute of Hematology and Oncology, Harbin, China. Department of Hematology, Tianjin Medical University General Hospital, Tianjin, China. Department of Hematology, Peking University First Hospital, Beijing, China. Fujian Institute of Hematology, Fujian Provincial Key Laboratory on Hematology, Fujian Medical University Union Hospital, Fuzhou, China. Department of Hematology, Affiliated Hospital of Xuzhou Medical University, Xuzhou, China. Department of Hematology, Beijing Tongren Hospital, Capital Medical University, Beijing, China. The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital, Zhengzhou, China. Department of Hematology, The First Affiliated Hospital of Dalian Medical University, Dalian, China. Department of Hematology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China. Department of Biostatistics, Peking University Clinical Research Institute, Beijing, China. Department of Hematology, Peking University People's Hospital, Beijing, China; Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China; Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China. Electronic address: xjhrm@medmail.com.cn.