1. Department of Neurology II, The Affiliated Hospital of Weifang Medical University, School of Clinical Medicine, Weifang Medical University, Weifang, Shandong 261041, P.R. China
2. Department of Emergency, The Affiliated Hospital of Weifang Medical University, School of Clinical Medicine, Weifang Medical University, Weifang, Shandong 261041, P.R. China