[1] McMaster Univ, Div Urol, Hamilton, ON, Canada
[2] Dana Farber Canc Inst, Dept Pathol, Boston, MA 02115 USA
[3] St Orsola Marcello Malpighi Hosp, Addarii Inst, Pathol Unit, Bologna, Italy
[4] Harvard Sch Publ Hlth, Dept Epidemiol, Boston, MA USA
[5] Brigham & Womens Hosp, Dept Radiat Oncol, Boston, MA 02115 USA
[6] Orebro Univ Hosp, Dept Urol, Orebro, Sweden
[7] Karolinska Inst, Dept Med Epidemiol, Stockholm, Sweden
[8] Brigham & Womens Hosp, Channing Lab, Boston, MA 02115 USA