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Sadayoshi Hatta
Department of Hygiene, Nihon Medical College
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Kôsaku Aoyama
Department of Hygiene, Nihon Medical College
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Yûgaku Sakai
Department of Hygiene, Nihon Medical College
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Tatsuta Shimizu
Showa Pharmaceutical College
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Masao Nakamura
Bacteriological Division, National Hygienic Laboratory
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Fumio Miyazawa
Bacteriological Division, National Hygienic Laboratory
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Eiko Sakuma
Bacteriological Division, National Hygienic Laboratory