1. Department of Cardiovascular Surgery, St. Luke’s International Hospital, Tokyo, Japan
2. Department of Cardiovascular Surgery, National Hospital Organization, Osaka National Hospital, Osaka, Osaka, Japan
3. Department of Cardiovascular Surgery, Kindai University, Osakasayama, Osaka, Japan
4. Department of Cardiovascular Surgery, Fukushima Medical University, Fukushima, Fukushima, Japan
5. Department of Cardiovascular Surgery, Hokushin General Hospital, Nakano, Nagano, Japan
6. Department of Cardiovascular Surgery, University Hospital Kyoto Prefectural University Hospital, Kyoto, Kyoto, Japan
7. Department of Cardiac Surgery, Kawasaki Heart Center, Kawasaki, Kanagawa, Japan
8. Department of Cardiovascular Surgery, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan
9. Department of Cardiovascular Surgery, Shonan Kamakura General Hospital, Kamakura, Kanagawa, Japan