[1] Kawasaki Med Sch, Div Cardiol, Kurashiki, Okayama 7010192, Japan
[2] Kawasaki Med Sch, Dept Cardiovasc Surg, Kurashiki, Okayama 7010192, Japan
[3] Kameda Med Ctr, Dept Cardiovasc Surg, Kamogawa, Japan
[4] Kameda Med Ctr, Dept Cardiol, Kamogawa, Japan