1 National Institute for Communicable Disease Control and Prevention, State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, Department of Nosocomial Infection, China.
2 Peking University First Hospital, Department of Haematology, China.
3 Peking University First Hospital, Department of Haematology, China. Electronic address: dongy@hsc.pku.edu.cn.