1. Department of Neurology, Hiroshima City Hiroshima Citizens Hospital, Japan
2. Department of Neurology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Japan
3. Department of Radiology, Hiroshima City Hiroshima Citizens Hospital, Japan
4. Department of Neurosurgery and Neuroendovascular Surgery, Hiroshima City Hiroshima Citizens Hospital, Japan
5. Department of Pathology, Hiroshima City Hiroshima Citizens Hospital, Japan