[1] Cent South Univ, Xiangya Hosp 2, Dept Gen Surg, Changsha, Peoples R China
[2] Cent South Univ, Xiangya Nursing Sch, Changsha, Peoples R China
[3] Capital Med Univ, Beijing Tiantan Hosp, Dept Resp, Beijing, Peoples R China
[4] Cent South Univ, Xiangya Hosp 2, Clin Nursing Teaching & Res Sect, Changsha, Peoples R China
[5] Huaihua Second Peoples Hosp, Dept Gen Surg, Huaihua, Peoples R China