[1] Huazhong Univ Sci & Technol, Tongji Hosp, Tongji Med Coll, Wuhan 430030, Peoples R China
[2] Wuhan Pulm Hosp, Dept Resp & Crit Care Med, Wuhan, Peoples R China
[3] Ludwig Maximilians Univ Munchen, Inst Med Informat Biometry & Epidemiol, Munich, Germany