[1]China Japan Friendship Hosp, Dept Resp & Crit Care Med, 2 Yinhuayuan Dong Lu, Beijing 100029, Peoples R China;
[2]Fudan Univ, Zhongshan Hosp, Dept Resp Med, Shanghai 200032, Peoples R China;
[3]Nanjing Med Univ, Affiliated Hosp 1, Dept Resp Med, Nanjing 210029, Jiangsu, Peoples R China;
[4]Gen Hosp Shenyang Mil Reg, Dept Resp Med, Shenyang 110015, Liaoning, Peoples R China;
[5]Southern Med Univ, Nanfang Hosp, Dept Resp Med, Guangzhou 510515, Guangdong, Peoples R China;
[6]Sichuan Univ, West China Hosp, Dept Resp Med, Chengdu 610041, Sichuan, Peoples R China;
[7]Fourth Mil Med Univ, Xijing Hosp, Dept Resp Med, Xian 710032, Shaanxi, Peoples R China;
[8]Third Mil Med Univ, Xinqiao Hosp, Dept Resp Med, Chongqing 400037, Peoples R China;
[9]Shanghai Jiao Tong Univ, Peoples Hosp 1, Dept Resp Med, Shanghai 200080, Peoples R China