1. Department of Neurological Surgery, Nippon Medical School Chiba Hokusoh Hospital
2. Department of Neurosurgery, Heiseitateishi Hospital
3. Department of Emergency and Critical Care Medicine, Tamanagayama Hospital, Nippon Medical School
4. Department of Neurological Surgery, Tamanagayama Hospital, Nippon Medical School
5. Department of Neurological Surgery, Nippon Medical School Hospital