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Masao Ito
Dept. of Hygiene Nihon Univ. School of Medicine
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Ruriko Maru
Dept. of Hygiene Nihon Univ. School of Medicine
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Takaaki Kinoue
Dept. of Hygiene Nihon Univ. School of Medicine
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Kaname Hirayanagi
Dept. of Hygiene Nihon Univ. School of Medicine
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Kazuyoshi Yajima
Dept. of Hygiene Nihon Univ. School of Medicine