[1] Cent South Univ, Pain Management Dept, Hunan Canc Hosp, Affiliated Canc Hosp,Xiangya Sch Med, Changsha, Hunan, Peoples R China
[2] Cent South Univ, Dept Nursing, Hunan Canc Hosp, Affiliated Canc Hosp,Xiangya Sch Med, Changsha 410013, Hunan, Peoples R China