Hung-Lung Hsu1, Chun-Yang Huang2, Jer-Shen Chen3. 1. Department of Cardiovascular Surgery, Far Eastern Memorial Hospital, New Taipei City, Taiwan; Faculty of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan. 2. Department of Cardiovascular Surgery, Far Eastern Memorial Hospital, New Taipei City, Taiwan. 3. Department of Cardiovascular Surgery, Far Eastern Memorial Hospital, New Taipei City, Taiwan; Faculty of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan. Electronic address: jershen@gmail.com.