[1] Natl Cerebral & Cardiovasc Ctr, Dept Cardiovasc Med, Suita, Osaka 5658565, Japan
[2] Kumamoto Univ, Grad Sch Med Sci, Dept Cardiovasc Med, Kumamoto, Japan
[3] Kumamoto Univ, Grad Sch Med Sci, Dept Adv Cardiovasc Med, Kumamoto, Japan
[4] Stanford Univ, Med Ctr, Div Cardiovasc Med, Stanford, CA 94305 USA