1. Department of Neurology, The First Affiliated Hospital of Hainan Medical University , Haikou, Hainan, P.R. China
2. Department of Neurology, The Second Affiliated Hospital of Hainan Medical University , Haikou, Hainan, P.R. China
3. Department of Intensive Care Unit, The First Affiliated Hospital of Hainan Medical University , Haikou, Hainan, P.R. China