1. Department of Anesthesiology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 313000, P.R. China
2. Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, Fujian 350001, P.R. China
3. Jiangsu Provincial Institute of Health Emergency, Xuzhou Medical University, Xuzhou, Jiangsu 221002, P.R. China
4. Department of Emergency, First People's Hospital, Pizhou, Jiangsu 221300, P.R. China