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Kazuki Sakakura
Department of Internal Medicine, Mito Medical Center, University of Tsukuba, Japan
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Norio Takayashiki
Department of Pathology, Mito Medical Center, University of Tsukuba, Japan
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Yasuharu Tokuda
Department of Internal Medicine, Mito Medical Center, University of Tsukuba, Japan
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Hiroaki Satoh
Department of Internal Medicine, Mito Medical Center, University of Tsukuba, Japan