[1] Univ Hong Kong, Queen Mary Hosp, Div Resp & Crit Care Med, Hong Kong, Peoples R China
[2] Univ Hong Kong, Div Resp Med, Shenzhen Hosp, Shenzhen, Peoples R China
[3] China Japan Friendship Hosp, Dept Pulm & Crit Care Med, Beijing, Peoples R China
[4] Chinese Acad Med Sci, Natl Ctr Resp Med, Inst Resp Med, Beijing, Peoples R China
[5] Natl Clin Res Ctr Resp Dis, Beijing, Peoples R China