1. Hebei Key Laboratory of Nerve Injury and Repair, Institute of Basic Medicine, Chengde Medical University, Chengde, Hebei 067000, P.R. China
2. Department of Critical Care Medicine, The Fifth Medical Center, Chinese People's Liberation Army General Hospital, Beijing 100071, P.R. China
3. State Key Laboratory of Pathogens and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences, Beijing 100071, P.R. China