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Ken Aizawa
Department of Bacteriology, Faculty of Medicine, Nippon University
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Yasuo Yamaguchi
Department of Bacteriology, Faculty of Medicine, Nippon University
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Soku Murakami
Department of Bacteriology, Faculty of Medicine, Nippon University
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Hideo Sakabe
Department of Bacteriology, Faculty of Medicine, Nippon University
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Tadashi Nakamura
Department of Bacteriology, Faculty of Medicine, Nippon University
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Masakazu Hashimoto
Department of Hygiene, Tokyo Medical and Dental University
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Kazuyuki Tezuka
Department of Hygiene, Tokyo Medical and Dental University