[Li, Jianmin] Hunan Prov Peoples Hosp, Dept Resp Med, Changsha, Hunan, Peoples R China.
[Guan, Jing] First Hosp Changsha City, Dept Emergency Med, Changsha, Hunan, Peoples R China.
[Long, Xiaoping] Univ South China, Dept Resp Med, Affiliated Hosp 1, Hengyang, Peoples R China.
[Xiang, Xudong] Cent S Univ, Dept Resp Med, Xiangya Hosp 2, Changsha 410011, Hunan, Peoples R China.
[Xiang, Xudong] Cent S Univ, Dept Resp Med, Xiangya Hosp 2, 139 Middle Renmin Rd, Changsha 410011, Hunan, Peoples R China.