1 Department of Neurology and China-America Institute of Neuroscience, Xuanwu Hospital, Capital Medical University, Beijing 100053, China; Beijing Institute of Brain Disorders, Capital Medical University, Beijing 100053, China.
2 Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston 02215, USA.
3 Department of Neurology and China-America Institute of Neuroscience, Xuanwu Hospital, Capital Medical University, Beijing 100053, China; Beijing Institute of Brain Disorders, Capital Medical University, Beijing 100053, China. Electronic address: jixm@ccmu.edu.cn.