1. Department of Neurosurgery, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou, Jiangsu
2. Department of Neurosurgery, Qilu Hospital of Shandong University (Qingdao), Qingdao, Shandong
3. Department of Neurosurgery, Tianjin Huanhu Hospital
4. Department of Neurosurgery, Tianjin Central Hospital for Neurosurgery and Neurology, Tianjin, China