[1] Huazhong Univ Sci & Technol, Union Hosp, Tongji Med Coll, Dept Emergency Med, Wuhan 430022, Peoples R China
[2] Huazhong Univ Sci & Technol, Union Hosp, Tongji Med Coll, Dept Gerontol, Wuhan 430022, Peoples R China
[3] Guangzhou Med Univ, Affiliated Hosp 1, Natl Clin Res Ctr Resp Dis, Guangzhou Inst Resp Hlth,State Key Lab Resp Dis, Guangzhou, Peoples R China
[4] Heart & Lung Inst Utah, Salt Lake Reg Med Ctr, Dept Internal Med, Div ICU & Resp Serv, Salt Lake City, UT USA