[1] Dana Farber Canc Inst, Boston, MA 02115 USA
[2] Harvard Univ, Sch Publ Hlth, Boston, MA 02115 USA
[3] Dana Farber Canc Inst, Lank Ctr Genitourinary Oncol, Boston, MA 02115 USA
[4] Mt Vernon Canc Ctr, London, England
[5] Karolinska Inst, Stockholm, Sweden
[6] Brigham & Womens Hosp, Dana Farber Canc Inst, Boston, MA 02115 USA