[1] Chinese Acad Med Sci & Peking Union Med Coll, Sch Populat Med & Publ Hlth, Beijing, Peoples R China
[2] Cent South Univ, Xiangya Hosp, Branch Natl Clin Res Ctr Resp Dis, Dept Resp Med,Natl Key Clin Specialty, Changsha, Peoples R China
[3] China Japan Friendship Hosp, Dept Pulm & Crit Care Med, Ctr Resp Med, Beijing, Peoples R China
[4] Natl Ctr Resp Med, Beijing, Peoples R China
[5] Chinese Acad Med Sci, Inst Resp Med, Beijing, Peoples R China
[6] Natl Clin Res Ctr Resp Dis, Beijing, Peoples R China
[7] China Japan Friendship Hosp, Dept Clin Res & Data Management, Ctr Resp Med, Beijing, Peoples R China