Affiliation: | a Akita Occupational Health Promotion Centre, Akita, Japan b Akita Prefectural Mental Health and Welfare Centre, 2-1-51 Nakadori, Akita City, Akita 010-0001, Japan c Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan d Department of Environmental Health Sciences, Akita University Graduate School of Medicine, Akita, Japan |