1. Department of Neurology Fukui‐ken Saiseikai Hospital Fukui Japan
2. Second Department of Internal Medicine Faculty of Medical Sciences University of Fukui Fukui Japan
3. Department of Hematology Fukui‐ken Saiseikai Hospital Fukui Japan
4. Department of Neurosurgery Faculty of Medical Sciences University of Fukui Fukui Japan
5. Kansai Multiple Sclerosis Center and Kyoto Min‐iren Central Hospital Kyoto Japan
6. Department of Aging and Dementia Faculty of Medical Sciences University of Fukui Fukui Japan