1. Department of Cardiovascular Surgery, National Hospital Organization Osaka National Hospital, Osaka, Japan
2. Department of Cardiovascular Surgery, Fukushima Medical University, Fukushima, Japan
3. Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
4. Department of Cardiovascular Surgery, Gifu University Graduate School of Medicine, Gifu, Japan
5. Department of Thoracic and Cardiovascular Surgery, Wakayama Medical University, Wakayama, Japan
6. Department of Cardiovascular Surgery, St Luke's International Hospital, Tokyo, Japan
7. Department of Cardiothoracic Surgery, Excela Health Westmoreland Hospital, Jeannette, United States
8. Department of Cardiovascular Surgery, Tokyo-Bay Urayasu Ichikawa Medical Center, Chiba, Japan
9. Department of Cardiovascular Surgery, Kindai University, Higashiosaka, Japan
10. Department of Cardiovascular Surgery, Higashi-Takarazuka Satoh Hospital, Hyogo, Japan