1. Department of Neurosurgery, Kouhoukai Takagi Hospital, Okawa, Japan
2. Department of Neurology, Imari Arita Kyoritsu Hospital, Arita, Japan
3. Department of Neurosurgery, Imari Arita Kyoritsu Hospital, Arita, Japan
4. Department of Neurosurgery, Shiroishi Kyoritsu Hospital, Shiroishi, Japan
5. Department of Neurosurgery, Faculty of Medicine, Saga University, Saga, Japan
6. Department of Neurosurgery, International University of Health and Welfare Narita Hospital, Narita, Japan