1. School of Stomatology, Xuzhou Medical University, Xuzhou, Jiangsu 221004, P.R. China
2. Department of Neurology, The Second Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221000, P.R. China
3. Department of Cardiology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221000, P.R. China