1. Department of Neurology, Yidu Central Hospital of Weifang, Weifang, Shandong 262500, P.R. China
2. Department of Oncology, Yidu Central Hospital of Weifang, Weifang, Shandong 262500, P.R. China
3. Department of Nephrology, Yidu Central Hospital of Weifang, Weifang, Shandong 262500, P.R. China
4. Department of Internal Neurology, Anqiu People's Hospital, Anqiu, Shandong 262100, P.R. China