[1] Hokkaido Cardiovasc Hosp, Dept Cardiol, Sapporo, Japan
[2] Sapporo Med Univ, Sch Med, Dept Cardiovasc Renal & Metab Med, Sapporo, Japan
[3] Sapporo Med Univ Hosp, Div Rehabil, Sapporo, Japan
[4] Sapporo Med Univ, Grad Sch Med, Sapporo, Japan
[5] Japanese Red Cross Asahikawa Hosp, Dept Rehabil, Asahikawa, Japan