[1] Qianwei Hosp Jilin Prov, Dept Resp, Changchun 130012, Jilin, Peoples R China
[2] First Hosp Jilin Univ, Jilin Prov Geriatr Med Clin Res Ctr, Dept Geriatr, Changchun 130021, Peoples R China
[3] First Hosp Jilin Univ, Dept Emergency, Changchun 130021, Peoples R China
[4] First Hosp Jilin Univ, Operating Room 2, First Operating Room, Changchun 130021, Peoples R China