[1] Xiqing Hosp, Dept Gerontol, Tianjin, Peoples R China
[2] Logist Univ CAPF, Pingjin Hosp, Cardiovasc Div Gerontol, Tianjin, Peoples R China
[3] Tianjin Univ Tradit Chinese Med, Postgrad Sch, Tianjin, Peoples R China
[4] Fourth Mil Med Univ, Tangdu Hosp, Dept Radiol, Xian, Shaanxi, Peoples R China
[5] Univ Ottawa, Inst Heart, Ottawa, ON, Canada