[1] Sichuan Univ, West China Hosp, West China Sch Nursing, POB 610041,37 Guo Xue St, Chengdu, Sichuan, Peoples R China
[2] Sichuan Univ, West China Hosp, Dept Breast Surg, Tumor Ctr, POB 610041,37 Guo Xue St, Chengdu, Sichuan, Peoples R China
[3] Sichuan Univ, West China Hosp, Dept Anesthesia, POB 610041,37 Guo Xue St, Chengdu, Sichuan, Peoples R China
[4] Sichuan Univ, West China Hosp, West China Sch Med, POB 610041,37 Guo Xue St, Chengdu, Sichuan, Peoples R China