[1] Okayama Univ Hosp, Cardiovasc Med, Okayama, Japan
[2] Jichi Med Univ, Clin Lab Med, Shimotsuke, Tochigi, Japan
[3] Kasaoka Daiichi Hosp, Dept Cardiol, Kasaoka, Japan
[4] Iwakuni Clin Ctr, Dept Cardiol, Iwakuni, Japan
[5] Sakurabashi Watanabe Hosp, Dept Cardiol, Osaka, Japan