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Susumu IMAMURA
Department of Microbiology, School of Medicine, Gunma University
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Shigeyasu KANBE
Department of Microbiology, School of Medicine, Gunma University
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Masanobu MITSUHASHI
Department of Microbiology, School of Medicine, Gunma University
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Mitsuo KAMETA
Maebashi Gunma Prefectural Institute of Health