1. Department of Neurology Research Institute for Brain and Blood Vessels‐Akita AkitaJapan
2. Division of Neurology Department of Brain and Neurosciences Faculty of Medicine Tottori University YonagoShimaneJapan
3. Department of Neurology Matsue City Hospital Matsue ShimaneJapan
4. Division of Rehabilitation Okayama Kyokuto Hospital Naka‐ku Okayama Okayama Japan
5. Department of Neurology Okayama Kyokuto Hospital Naka‐ku Okayama OkayamaJapan
6. Department of Cardiovascular Medicine, Nephrology and Neurology Graduate School of Medicine University of the Ryukyus Nishihara‐cho Nakagusuku‐gun OkinawaJapan
7. Department of Neurology National Hospital Organization Okinawa National Hospital Ginowan OkinawaJapan
8. National Hospital Organization Matsue Medical Center Matsue TottoriJapan
9. Division of Neurology and Gerontology Department of Internal Medicine School of medicine Iwate Medical University Morioka Iwate Japan