1. Department of Cardiovascular Surgery, Kameda Medical Center, Kamogawa, Chiba, Japan
2. Department of Cardiovascular Surgery, Tenri Hospital, Tenri, Nara, Japan
3. Department of Cardiovascular Surgery, Hirakata Kohsai Hospital, Hirakata, Osaka, Japan
4. Department of Cardiovascular Surgery, Mitsui Memorial Hospital, Tokyo, Japan
5. Department of Cardiovascular Surgery, Fukuoka Child’s Hospital, Fukuoka, Fukuoka, Japan