[Chen, Hong; Ou, Mei-jun] Cent South Univ, Hunan Canc Hosp, Xiangya Sch Med, Head & Neck Surg Dept,Affiliated Canc Hosp, Changsha, Peoples R China.
[Xu, Xiang-hua] Cent South Univ, Hunan Canc Hosp, Xiangya Sch Med, Hlth Serv Ctr,Affiliated Canc Hosp, Changsha, Peoples R China.
[Chen, Fu-rong] Univ South China, Sch Nursing, Hengyang, Peoples R China.
[Shen, Shuai] Hunan Normal Univ, Hosp Changsha 4, Dept Gen Surg, Changsha Hosp, Changsha, Peoples R China.