Affiliation: | Department of Environmental Medicine and Informatics, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060 (Japan), Fax +81 11 717 0629, e-mail: futoshi@eesbio.hokudai.ac.jp, JP Department of Public Health and Environmental Medicine, The Jikei University School of Medicine, Minato-ku, Tokyo 105 (Japan), JP
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