1. Department of Neurology, The Second Affiliated Hospital, Hunan University of Chinese Medicine, Changsha, Hunan 410005, P.R. China
2. Xiang Ya Nursing School of Central South University, Changsha, Hunan 410013, P.R. China
3. Department of Emergency, Xiang Ya Hospital, Central South University, Changsha, Hunan 410008, P.R. China