1. Luhe Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical University, Beijing 101100, China
2. Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI 48201, USA
3. Department of Research & Development Center, John D. Dingell VA Medical Center, Detroit, MI 48201, USA
4. Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
5. Department of Neurology, Beijing Luhe Hospital, Capital Medical University, Beijing 101100, China