1. Department of Neurology, Hainan General Hospital, Haikou 570311, China
2. Department of Critical Care Medicine, Hainan General Hospital, Haikou 570311, China
3. Neurorehabilitation Dept. 2, Guangzhou General Hospital of Guangzhou Military Command of PLA, Guangzhou 510120, China
4. Department of Neurology, The Affiliated Houjie Hospital, Guangdong Medical University, Dongguan 523945, China