[1] Mem Sloan Kettering Canc Ctr, Dept Epidemiol & Biostat, New York, NY 10021 USA
[2] Mem Sloan Kettering Canc Ctr, Dept Surg, New York, NY 10021 USA
[3] Univ Calif San Francisco, Dept Urol, San Francisco, CA 94143 USA
[4] New England Res Inst Inc, Watertown, MA USA