1. Asaka Hospital, Koriyama City, Japan
2. Department of Neuropsychiatry, School of Medicine, Keio University, 35, Shinanomachi, Shinjuku-ku, Tokyo, 160–8582, Japan
3. Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Japan
4. Department of Social Welfare, Faculty of Sociology, Meiji Gakuin University, Japan
5. Department of Psychiatry and behavioural Science, School of Medicine, University of Auckland, New Zealand