[1] Tohoku Univ, Grad Sch Med, Dept Cardiovasc Med, Sendai, Miyagi, Japan
[2] Ishikawa Prefectural Cent Hosp, Dept Cardiol, Kanazawa, Ishikawa, Japan
[3] Fujita Hlth Univ, Dept Cardiol, Sch Med, Toyoake, Aichi, Japan
[4] Chiba Nishi Gen Hosp, Heart Inst, Div Cardiol, Matsudo, Chiba, Japan
[5] Tohoku Univ, Div Epidemiol, Dept Publ Hlth & Forens Med, Grad Sch Med, Sendai, Miyagi, Japan