1. Department of Neurosurgery, School of Medicine, Second Military Medical University (Shanghai), Jinling Hospital, Nanjing, Jiangsu Province, People's Republic of China.
2. Department of Neurosurgery, School of Medicine, Nanjing University, Jinling Hospital, Nanjing, Jiangsu Province, People's Republic of China.
3. Department of Pathology, Zhongda Hospital, Southeast University, Nanjing, Jiangsu Province, People's Republic of China.