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K. TOTSUKAWA
School of Medicine, Tohoku University
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T. KAYABA
Faculty of Agriculture, Yamagata University
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H. UENO
Yamagata Prefectural Swine Experiment Station
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S. SUTO
Yamagata Prefectural Swine Experiment Station
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M. TOGASHI
Yamagata Prefectural Swine Experiment Station