| Affiliation: | 1. Environmental Epidemiology Section, Centre for Environmental Health Sciences, National Institute for Environmental Studies, Tsukuba, Japan;2. Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Tokyo, Japan;3. Department of Environmental and Occupational Health, School of Medicine, Toho University, Tokyo, Japan;4. Department of Otolaryngology, Head and Neck Surgery, National Defense Medical College, Saitama, Japan;5. Department of Otorhinolaryngology, Head and Neck Surgery, School of Medicine, Keio University, Tokyo, Japan |
