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Ichiyo MATSUZAKI
Institute of Community Medicine, University of Tsukuba
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Akio NISHIMURA
Ibaraki Prefectural Health Science Centre
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Nobuaki MORITA
Institute of Community Medicine, University of Tsukuba
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Shinji SATOH
Institute of Community Medicine, University of Tsukuba
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Toshio KOBAYASHI
Tokyo University of Mercantile Marine
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Masataka MURAKAMI
Institute of Community Medicine, University of Tsukuba