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Tohru Tsuda
Medical Corporation K-You Tsuda Hospital
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Yukiko Okabe
Department of Respiratory Medicine, University of Occupational and Environmental Health, Japan
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Takuro Kitamura
Department of Otolaryngology, University of Occupational and Environmental Health, Japan
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Yoshiyuki Hino
Occupational Health Training Center, University of Occupational and Environmental Health, Japan
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Yasuo Morimoto
Department of Occupational Pneumology, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Japan
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Masamitsu Kido
Department of Respiratory Medicine, University of Occupational and Environmental Health, Japan