[Zhang, Tianqing] First Peoples Hosp Changde City, Dept Cardiol, Changde 415003, Hunan, Peoples R China.
[Deng, Wenxu] Cent Hosp Hengyang, Hengyang 421001, Hunan, Peoples R China.
[Deng, Ying; He, Qi] Peoples Hosp Ningxiang City, Ningxiang, Hunan, Peoples R China.
[Liu, Yao] Univ South China, Affiliated Hosp 2, Hengyang Medcial Sch, Dept Cardiovasc Med, Hunan 421001, Peoples R China.
[Xiao, Sijie] First Peoples Hosp Changde City, Dept Ultrasound, Changde 415003, Peoples R China.