[1] Anhui Med Univ, Hefei Peoples Hosp 1, Dept Resp Med, Hosp 3, Huaihe Rd 390, Hefei 230061, Anhui, Peoples R China
[2] Anhui Med Univ, Hosp 2, Dept Resp Med, Hefei, Anhui, Peoples R China
[3] Hefei 3rd Peoples Hosp, Dept Resp Med, Hefei, Anhui, Peoples R China
[4] Chaoyang Hosp, Dept Resp Med, Huainan, Anhui, Peoples R China
[5] Dongfang Hosp, Dept Resp Med, Huainan, Anhui, Peoples R China
[6] Fuyang Peoples Hosp, Dept Resp Med, Fuyang, Anhui, Peoples R China
[7] Huaibei Ist Peoples Hosp, Dept Resp Med, Huaibei, Anhui, Peoples R China
[8] Luan Ist Peoples Hosp, Dept Resp Med, Luan, Anhui, Peoples R China
[9] Bengbu 3rd Peoples Hosp, Dept Resp Med, Bengbu, Anhui, Peoples R China
[10] Hefei Binhu Hosp, Dept Resp Med, Hefei, Anhui, Peoples R China