[1] Daejeon St. Mary’s Hospital,Department of Thoracic and Cardiovascular Surgery
[2] The Catholic University of Korea,Department of Thoracic and Cardiovascular Surgery
[3] Uijeongbu St. Mary’s Hospital,Department of Thoracic and Cardiovascular Surgery
[4] The Catholic University of Korea,undefined
[5] St. Paul’s Hospital,undefined
[6] The Catholic University of Korea,undefined