1. Department of Cardiovascular surgery, Hyogo Prefectural Amagasaki General Medical Center, Amagasaki, Hyogo, Japan
2. Department of Pediatric Cardiology, Hyogo Prefectural Amagasaki General Medical Center, Amagasaki, Hyogo, Japan
3. Department of Cardiovascular Surgery, Kyoto University Hospital, Sakyo-ku, Kyoto, Japan