1. Hangzhou Red Cross Hospital, Department of Neurosurgery, Hangzhou, Zhejiang, People's Republic of China.
2. Affiliated Hospital of North Sichuan Medical College, Department of Emergency, Shunqing, Sichuan, People's Republic of China.
3. Shandong University, The People's Hospital of Zhaoyuan City, Department of Neurosurgery, Zhaoyuan City, Shandong, People's Republic of China.