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Katsuhiko Matsuyama
Department of Cardiovascular Surgery, Gifu Prefectural Tajimi Hospital, Tajimi, Gifu, Japan
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Tomohiro Nakayama
Department of Cardiovascular Surgery, Gifu Prefectural Tajimi Hospital, Tajimi, Gifu, Japan
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Hiroaki Hagiwara
Division of Cardiovascular Surgery, Kasugai Munincipal Hospital, Kasugai, Aichi, Japan