1. Department of Environmental and Occupational Health, School of Medicine, Toho University, 5-21-16 Omori-nishi, Ota-ku, Tokyo143-8540, Japan
2. Health and Environmental Risk Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
3. Department of Emergency and Critical Care Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo160-8582, Japan
4. Regional Environment Conservation Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
5. Department of Hygiene, Graduate School of Medicine, Hokkaido University, Kita 15, Nishi 7, Kita-ku, Sapporo 060-8638, Japan
6. Environmental Health Sciences, Kyoto University Graduate School of Global Environmental Studies, Kyoto Daigaku Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
7. Tokyo Metropolitan Research Institute for Environmental Protection, 1-7-5 Shinsuna,
Koto-ku, Tokyo136-0075, Japan