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Hiroshi Yamaguchi
Division of Internal Medicine, Yamagata Saisei Hospital
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Kazuo Okumoto
Department of Gastroenterology, Yamagata University
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Eijiro Omoto
Department of Hematology, Yamagata Prefectural Central Hospital
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Tsuneo Konta
Department of Cardiology, Pulmonology and Nephrology, Yamagata University