[1] Cent South Univ, Xiangya Hosp, Ctr Coronary Circulat, Dept Geriatr Med, Changsha 410008, Peoples R China
[2] Cent South Univ, Xiangya Hosp, Natl Clin Res Ctr Geriatr Disorders, Changsha 410008, Peoples R China
[3] Cent South Univ, Dept Social Med & Hlth Management, Changsha 410078, Peoples R China
[4] Cent South Univ, Xiangya Hosp, Dept Cardiovasc Med, Changsha 410008, Peoples R China
[5] Cent South Univ, Xiangya Hosp 3, Dept Cardiovasc Med, Changsha 410013, Peoples R China