1. Department of Neurology Kansai Electric Power Hospital Osaka Japan
2. Division of Clinical Neurology Kansai Electric Power Medical Research Institute Osaka Japan
3. Department of Neurology Kitano Hospital, Tazuke Kofukai Medical Research Institute Osaka Japan
4. Center for Sleep‐Related Disorders and Department of Neurology Kansai Electric Power Hospital Osaka Japan
5. Division of Sleep Medicine Kansai Electric Power Medical Research Institute Osaka Japan
6. Department of Neurology, Graduate School of Medicine Kyoto University Kyoto Japan
7. Advanced Comprehensive Research Organization Teikyo University Itabashi Japan
8. Department of Neurology Tokushima University Hospital Tokushima Japan
9. Department of Neurology, Faculty of Medicine Kyorin University Tokyo Japan