1 Department of Cardiovascular Surgery, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan. Electronic address: naotowakimachi@hotmail.co.jp.
2 Department of Cardiovascular Surgery, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan.
3 Department of Anesthesiology, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan.