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*Tetsuya HASEGAWA
Graduate school of International University of Health and Welfare
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Junji KATSUHIRA
Department of health science, International University of Health and Welfare
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Ko MATSUDAIRA
Clinical Research Center for Occupational Musculoskeletal Disorders,Kanto Rosai Hospital
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Kazuyuki IWAKIRI
National Institute of Occupational Safety and Health, Japan
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Hitoshi MARUYAMA
Department of health science, International University of Health and Welfare