1. Department of Neurosurgery, Itoigawa General Hospital, Niigata, Japan
2. Department of Neurology, Saitama Neuropsychiatric Institute, Saitama, Japan
3. Headache Center and Department of Neurology, Tominaga Hospital, Osaka, Japan
4. Department of Neurology, Osaka Saiseikai Nakatsu Hospital, Osaka, Japan
5. Department of Plastic Surgery, Osaka Metropolitan University, Osaka, Japan
6. Department of Clinical Training, St. Luke’s International Hospital, Tokyo, Japan
7. Department of Psychiatry, Saitama Neuropsychiatric Institute, Saitama, Japan
8. Department of Anaesthesiology, University of Toyama, Toyama, Japan