[1] Osaka City Univ, Grad Sch Med, Osaka 558, Japan
[2] Osaka Ekisaikai Hosp, Osaka, Japan
[3] Ichikawa Med Cntr, Tokyo Bay Urayasu, Heart Cntr, Urayasu, Japan
[4] Univ Tsukuba, Grad Sch Comprehens Human Sci, Tsukuba, Ibaraki, Japan
[5] Sakakibara Heart Inst, Fuchu, Tokyo, Japan
[6] Nishinomiya Watanabe Cardiovasc Cntr, Nishinomiya, Hyogo, Japan