1. Department of Neurosurgery, Norman Bethune College of Medicine, Jilin University, Changchun, China.
2. Department of Radiology of the First Hospital, Norman Bethune College of Medicine, Jilin University, Changchun, China.
3. Department of Immunology, Norman Bethune College of Medicine, Jilin University, Changchun, China.
4. Department of Pathology and Laboratory Medicine, University of California, Irvine, California.