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Nobuo KOIZUMI
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Eiichi HONDA
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Tetsuo KUMAGAI
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Katsunori OKAZAKI
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Author's Organization:Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology