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Matsuko UMEDA
Department of Hygiene, School of Medicine, Chiba University
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Kiyofumi ISHIKAWA
Department of Hygiene, School of Medicine, Chiba University
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Masayoshi OHMICHI
Department of Hygiene, School of Medicine, Chiba University
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Shigeki KOBAYASHI
Department of Hygiene, School of Medicine, Chiba University
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Katsumi KATAGIRI
Department of Examination and Research, Chiba Health Service Association