[1] Tohoku Univ, Grad Sch Med, Sendai, Miyagi, Japan
[2] Japanese Red Cross Kumamoto Hosp, Kumamoto, Japan
[3] Sakakibara Heart Inst, Tokyo, Japan
[4] Yamagata Prefectural Cent Hosp, Yamagata, Japan
[5] Niigata Prefectural Shibata Hosp, Niigata, Japan
[6] Ehime Prefectural Niihama Hosp, Niihama, Ehime, Japan
[7] Keio Univ, Sch Med, Tokyo, Japan
[8] Jichi Med Univ, Saitama Med Cntr, Saitama, Japan
[9] Kumamoto Univ, Grad Sch Med Sci, Kumamoto, Japan