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Junichi KAWANO
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Tsukasa ISHIMARU
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Akira SHIMIZU
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Shige KIMURA
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Author's Organization:Department of Animal Hygiene, Faculty of Agriculture, Kobe University Department of Animal Hygiene, Faculty of Agriculture, Kobe University Department of Animal Hygiene, Faculty of Agriculture, Kobe University Department of Animal Hygiene, Faculty of Agriculture, Kobe University