[1] Peking Univ Third Hosp, Dept Urol, Beijing, Peoples R China
[2] Harvard Med Sch, Massachusetts Gen Hosp, Dept Urol, Boston, MA USA
[3] Harvard Med Sch, Massachusetts Gen Hosp, Dept Pathol, Boston, MA USA
[4] Cent South Univ, Xiangya Hosp, Natl Clin Res Ctr Geriatr Disorders, Dept Urol, Changsha, Peoples R China