[1] Capital Med Univ, Beijing Hosp, Beijing Inst Resp Med,Minist Hlth, Dept Resp Med,Beijing Key Lab Resp & Pulm Circula, Beijing 100730, Peoples R China
[2] Sichuan Univ, W China Med Ctr, Dept Resp Med, Chengdu, Peoples R China
[3] Chang Gung Univ Sci & Technol, Chang Gung Mem Hosp, Kaohsiung Med Ctr, Dept Resp Therapy, Chiayi, Taiwan