1. Department of Neurology, Dalian Municipal Central Hospital Affiliated to Dalian Medical University, Dalian, Liaoning 116033, P.R. China
2. Department of General Medicine, Central Hospital Affiliated to Shaoxing University, Shaoxing, Zhejiang 312000, P.R. China
3. Department of Neurology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
4. Department of Neurology, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong 264000, P.R. China
5. Department of Neurology, Dalian Medical University, Dalian, Liaoning 116033, P.R. China