1. First Department of Internal Medicine, University of Occupational and Environmental Health , Kitakyushu, Japan
2. Department of Rheumatology and Clinical Immunology, Wakayama Medical University , Wakayama, Japan
3. Department of Mental Disorder Research, National Institute of Neuroscience, National Centre of Neurology and Psychiatry , Tokyo, Japan
4. Department of Psychiatry, Teikyo University School of Medicine , Tokyo, Japan
5. Department of Radiology, University of Occupational and Environmental Health , Fukuoka, Japan
6. Department of Clinical Nursing, School of Health Sciences, University of Occupational and Environmental Health , Fukuoka, Japan
7. Department of Psychiatry, University of Occupational and Environmental Health , Fukuoka, Japan
8. Medical Center for Dementia, Hospital of the University of Occupational and Environmental Health , Fukuoka, Japan
9. Department of Bioresources, Medical Genome Center, National Centre of Neurology and Psychiatry , Tokyo, Japan