Department of Neurology, Affiliated Hospital of Medical College, Qingdao University, Qingdao, Shandong 266003, China;
Department of Neurology, People's Hospital, Weifang, Shandong 261041, China;
Department of Neurology, Affiliated Hospital of Medical College, Qingdao University, Qingdao, Shandong 266003, China;