[Luo, Danqing] Univ South China, Hengyang Med Sch, Affiliated Hosp 2, Spinal Surg, 35 Jiefang Ave, Hengyang 421000, Peoples R China.
[Yang, Jing] Univ South China, Hengyang Med Sch, Affiliated Hosp 2, Anorectal Dept, 35 Jiefang Ave, Hengyang 421000, Peoples R China.
[Liu, Junji] Cent Hosp Shaoyang, Dept Oncol, 36 Qianyuan Lane,Hongqi Rd, Shaoyang, Peoples R China.
[Yong, Xia] Wuhan Inst Technol, Biomed Ctr, Wuhan 430000, Peoples R China.
[Wang, Zhimin] Univ South China, Hengyang Med Sch, Affiliated Hosp 2, Human Resources Dept, 35 Jiefang Ave, Hengyang 421000, Peoples R China.