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Hiroshi OHARA
Department of Hygiene, Okayama University Medical School
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Shingo NAKAGIRI
Department of Hygiene, Okayama University Medical School
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Toru ITANI
Division of Work Physiology and Psychology, Institute for Science of Labour
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Kenzo WAKE
Department of Hygiene, Okayama University Medical School
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Hideyasu AOYAMA
Department of Hygiene, Okayama University Medical School