[1] Univ Calif San Francisco, Dept Urol, 400 Parnassus, San Francisco, CA 94121 USA
[2] Univ Calif San Francisco, Dept Epidemiol, San Francisco, CA USA
[3] Univ Calif San Francisco, Dept Biostat, San Francisco, CA USA
[4] Lahey Hosp & Med Ctr, Dept Urol, Burlington, MA USA
[5] Univ Texas MD Anderson Canc Ctr Houston, Dept Urol, Houston, TX USA