[1] Osaka City Univ, Grad Sch Med, Dept Internal Med & Cardiol, Abeno Ku, Osaka 5458585, Japan
[2] Osaka City Univ, Sch Med, Dept Internal Med & Cardiol, Osaka 5458585, Japan
[3] Tsukazaki Mem Hosp, Dept Cardiol, Hyogo, Japan
[4] Highlands Consulting Inc, San Jose, CA USA