1. Department of Preventive Medicine and Community Health, School of Medicine, University of Occupational and Environmental Health , Kitakyushu, Japan
2. Department of Rehabilitation Center, Fukuoka Mirai Hospital , Fukuoka, Japan
3. Department of Rehabilitation Medicine, School of Medicine, University of Occupational and Environmental Health , Kitakyushu, Japan
4. Department of Environmental Epidemiology, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health , Kitakyushu, Japan