1. Division of Public Health; Department of Social Medicine; Nihon University School of Medicine; Itabashi-ku Tokyo Japan
2. Department of Public Health and Epidemiology; Faculty of Medicine; Oita University; Yufu Oita Japan
3. Department of Psychiatry; Nihon University School of Medicine; Itabashi-ku Tokyo Japan
4. Department of Psychophysiology; National Institute of Mental Health; National Center of Neurology and Psychiatry; Kodaira Japan
5. Department of Neuropsychiatry; Kurume University School of Medicine; Kurume Japan
6. Department of Social Medicine; Hirosaki University Graduate School of Medicine; Hirosaki Japan
7. Division of Sleep Medicine; Department of Internal Medicine; Nihon University School of Medicine; Itabashi-ku Tokyo Japan