1. Department of Neurosurgery, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
2. Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China (mainland)
3. Department of Pathology, The First Hospital of Handan, Handan, Hebei, China (mainland)
4. Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China (mainland)
5. Department of Neurosurgery, The Fifth Central Hospital of Tianjin, Tianjin, China (mainland)