1. a Department of Psychiatry , Hirosaki-Aiseikai Hospital , 1-6-2 Kitazono, Hirosaki, Aomori 036-8151 , Japan
2. b Department of Neuropsychiatry , Hirosaki University School of Medicine , Hirosaki, Aomori 036-8216 , Japan
3. c Department of Social Medicine , Hirosaki University School of Medicine , Hirosaki, Aomori 036-8216 , Japan