[1] Natl Ctr Resp Med, Beijing, Peoples R China
[2] State Key Lab Resp Hlth & Multimorbid, Beijing, Peoples R China
[3] Natl Clin Res Ctr Resp Dis, Beijing, Peoples R China
[4] Chinese Acad Med Sci, Inst Resp Med, Beijing, Peoples R China
[5] China Japan Friendship Hosp, Ctr Resp Med, Dept Pulm & Crit Care Med, Beijing, Peoples R China
[6] China Japan Friendship Hosp, Ctr Resp Med, Dept Radiol, Beijing, Peoples R China