[1] Guangdong Med Univ, Affiliated Hosp 2, Dept Resp & Crit Care Med, Zhanjiang, Peoples R China
[2] Taishan Hosp Tradit Chinese Med, Dept Resp & Crit Care Med, Jiangmen, Peoples R China
[3] Guangdong Med Univ, Affiliated Hosp, Dept Emergency, Zhanjiang, Guangdong, Peoples R China
[4] Dongguan Maternal & Child Hlth Care Hosp, Dept Lab, Dongguan, Peoples R China
[5] Taishan Hosp Tradit Chinese Med, Dept Gynecol, Jiangmen, Peoples R China
[6] Jiaying Univ, Med Coll, Meizhou, Peoples R China
[7] Cent Peoples Hosp Zhanjiang, Dept Resp & Crit Care Med, Zhanjiang, Peoples R China
[8] Guangzhou Med Univ, Affiliated Hosp1, Guangzhou Inst Resp Hlth, State Key Lab Resp Dis,Natl Clin Res Ctr Resp Dis, Guangzhou, Peoples R China