[1] Univ Uppsala Hosp, Dept Urol, S-75185 Uppsala, Sweden
[2] Univ Uppsala Hosp, Reg Oncol Ctr, S-75185 Uppsala, Sweden
[3] Univ Uppsala Hosp, Dept Pathol, S-75185 Uppsala, Sweden
[4] Univ Helsinki, Cent Hosp, Dept Urol, Helsinki, Finland
[5] Univ Helsinki, Cent Hosp, Dept Pathol, Helsinki, Finland
[6] Kings Coll London, Guys Hosp, Sch Med, Div Canc Studies,Acad Oncol, London SE1 9RT, England
[7] Orebro Univ Hosp, Dept Urol, Orebro, Sweden
[8] Orebro Univ Hosp, Ctr Assessment Med Technol, Orebro, Sweden
[9] Boras Hosp, Dept Urol, Boras, Sweden
[10] Linkoping Univ Hosp, Dept Urol, S-58185 Linkoping, Sweden
[11] Karolinska Inst, Dept Med Epidemiol & Biostat, Stockholm, Sweden
[12] Harvard Sch Publ Hlth, Dept Epidemiol, Boston, MA USA