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Kyoji Hirai
Department of Cardiovascular and Thoracic Surgery, Nippon Medical School, Chiba Hokusou Hospital, Inzai, Chiba, Japan
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Takayuki Ibi
Department of Cardiovascular and Thoracic Surgery, Nippon Medical School, Chiba Hokusou Hospital, Inzai, Chiba, Japan
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Ryuzo Bessho
Department of Cardiovascular and Thoracic Surgery, Nippon Medical School, Chiba Hokusou Hospital, Inzai, Chiba, Japan
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Kiyoshi Koizumi
Department of Surgery, Nippon Medical School, Tokyo, Japan
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Kazuo Shimizu
Department of Surgery, Nippon Medical School, Tokyo, Japan