^○yuuto Narumiya¹, Keiji Yunoki¹, Munehiro Saiki¹, Shyouhei Yokoyama¹, Yoshimasa Kishi¹, Yuuki Ohga², Naoya Sakoda³, Takuya Kawabata¹, Yuu Ohshima¹, Kunikazu Hisamochi¹, Hideo Yoshida¹ (1.Department of Cardiovascular Surgery, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan, 2.Hiroshima Teishin Hospital, Hiroshima, Japan, 3.Department of Cardiovascular Surgery, Okayama University, Okayama, Japan)

^○Ryutaro Isoda, Ichiro Morita, Kensuke Kondo, Tatsuya Watanabe, Masayuki Mano, Masahiko Kuinose (Kawasaki Medical School General Medical Center)

^○Kenichi Arata¹, Kosuke Mukaihara¹, Shinya Kuramoto¹, Yoshikazu Kawazu¹, Yuta Siramomo¹, Tamahiro Kinjo¹, Itsumi Imagama², Yutaka Imoto² (1.Cardiovascular surgery,Kagoshima medical center, Kagoshima, Japan, 2.Cardiovascular and Gastroenterological Surgery, Kagoshima University Graduate School of Medical Dental Sciences)

^○Yuki Tada, Seima Ohira, Shingo Kunioka, Nobuyuki Akasaka (STEEL MEMORIAL MURORAN HOSPITAL, department of Cardiovascular Surgery, Muroran, Hokkaido, Japan)