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Naoaki Ohkubo
The First Department of Internal Medicine, University of Occupational and Environmental Health, Japan
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Kazuhisa Nakano
The First Department of Internal Medicine, University of Occupational and Environmental Health, Japan
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Ippei Miyagawa
The First Department of Internal Medicine, University of Occupational and Environmental Health, Japan
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Yoshiya Tanaka
The First Department of Internal Medicine, University of Occupational and Environmental Health, Japan