[1] Southwest Med Univ, Sch Nursing, Taiping St 25, Lu Zhou 646000, Peoples R China
[2] Southwest Med Univ, Affiliated Hosp, Dept Neurosurg, Taiping St 25, Lu Zhou 646000, Peoples R China
[3] Neurosurg Clin Med Res Ctr Sichuan Prov, Taiping St 25, Lu Zhou 646000, Peoples R China
[4] Southwest Med Univ, Affiliated Hosp, Dept Psychiat, Taiping St 25, Lu Zhou 646000, Peoples R China
[5] Southwest Med Univ, Affiliated Hosp Tradit Chinese Med, Dept Anorectal, Chunhui Rd 16, Lu Zhou 646000, Peoples R China