Chinese Academy of Social Sciences (CASS) - Institute of Sociology, General Hospital of Northern Theater Command - Department of Neurosurgery, General Hospital of Northern Theater Command - Department of Neurosurgery, General Hospital of Northern Theater Command - Department of Neurosurgery, General Hospital of Northern Theater Command - Department of Neurosurgery, General Hospital of Northern Theater Command - Department of Neurosurgery, General Hospital of Northern Theater Command - Department of Neurosurgery, General Hospital of Northern Theater Command - Department of Neurosurgery, General Hospital of Northern Theater Command - Department of Neurosurgery, General Hospital of Northern Theater Command - Department of Neurosurgery and General Hospital of Northern Theater Command - Department of Clinical Trial Management Agency