[1] Chongqing Med Univ, Sch Publ Hlth, Chongqing, Peoples R China
[2] Peoples Hosp Deyang City, Nursing Dept, Deyang City, Sichuan, Peoples R China
[3] Sichuan Canc Hosp & Inst, Dept Thorac Surg, Chengdu, Sichuan, Peoples R China
[4] Chongqing Med Univ, State Key Lab Ultrasound Med & Engn, Chongqing, Peoples R China
[5] Chongqing Med Univ, Sch Publ Hlth, State Key Lab Ultrasound Med & Engn, Chongqing, Peoples R China