1. Department of Respiratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8501, Japan
2. Department of Preventive Medicine and Community Health, University of Occupational and Environmental Health, Japan, Kitakyushu 807-0804, Japan
3. Department of Infectious Diseases, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8501, Japan
4. Department of Nursing, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8501, Japan
5. Department of Environmental Epidemiology, Institute of Industrial Ecological Science, University of Occupational and Environmental Health, Japan, Kitakyushu 807-0804, Japan
6. Department of Respiratory Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu 807-0804, Japan
7. Department of Health Policy and Informatics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Japan, Tokyo 113-8519, Japan