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Toshiaki Homma
Department of Respiratory Diseases, Institute of Clinical Medicine, University of Tsukuba
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Takahiro Ueno
Department of Respiratory Diseases, Institute of Clinical Medicine, University of Tsukuba
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Kiyohisa Sekizawa
Department of Respiratory Diseases, Institute of Clinical Medicine, University of Tsukuba
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Akiyo Tanaka
Department of Hygiene, Graduate School of Medical Sciences, Kyushu University
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Miyuki Hirata
Department of Hygiene, Graduate School of Medical Sciences, Kyushu University