[1] Cent South Univ, Dept Cardiol, Xiangya Hosp 2, Changsha, Peoples R China
[2] Hunan Normal Univ, Hunan Prov Peoples Hosp, Affiliated Hosp 1, Changsha, Peoples R China
[3] Xiangtan Cent Hosp, Xiangtan, Peoples R China
[4] Changsha Cent Hosp, Changsha, Peoples R China
[5] Zhuzhou Cent Hosp, Zhuzhou, Peoples R China
[6] Univ South China, Affiliated Hosp 1, Hengyang, Peoples R China
[7] Univ South China, Affiliated Hosp 2, Hengyang, Peoples R China
[8] Cent South Univ, Dept Geriatr, Xiangya Hosp 2, Changsha, Peoples R China