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Naofumi Takehara
Department of Cardiovascular Medicine, Rishiri National Health Insurance Hospital
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Yutaka Yamada
Department of Cardiovascular Medicine, Wakkanai Municipal Hospital
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Kazutomo Goto
Department of Cardiovascular Medicine, Wakkanai Municipal Hospital
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Naoyuki Hasebe
First Department of Medicine, Asahikawa Medical College
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Kenjiro Kikuchi
First Department of Medicine, Asahikawa Medical College