1. Department of Neurosurgery, Renji Hospital, Shanghai Second Medical University, Shanghai, People's Republic of China.
2. Department of Neurosurgery, Second Affiliated Hospital of Kunming Medical College, Kunming, People's Republic of China.
3. Department of Neurosurgery, Shenzheng Second People's Hospital, Shenzheng, People's Republic of China.
4. Department of Neurosurgery, Yixing People's Hospital, Yixing, People's Republic of China.
5. Department of Neurosurgery, Longgang Hospital, Longgang, People's Republic of China.