[1] Sichuan Univ, W China Hosp, Dept Pathol, Chengdu 610041, Peoples R China
[2] Sichuan Univ, W China Hosp, Dept Urol, Chengdu 610041, Peoples R China
[3] Sichuan Univ, W China Univ Hosp 2, Dept Pathol, Chengdu 610041, Peoples R China
[4] N Sichuan Med Coll, Affiliated Hosp, Dept Urol, Nanchong, Sichuan, Peoples R China