1. Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, China
2. Department of Neurology, Qingdao Municipal Hospital, Nanjing Medical University, Qingdao, China
3. College of Medicine and Pharmaceutics, Ocean University of China, Qingdao, China
4. Department of Neurology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
5. Memory and Aging Center, Department of Neurology, University of California, San Francisco, CA, USA