[1] Mt Sinai Hosp, Dept Clin Biochem, Toronto, ON M5G 1X5, Canada
[2] Univ Toronto, Dept Lab Med & Pathobiol, Div Clin Biochem, Toronto, ON, Canada
[3] Johns Hopkins Med Inst, Baltimore, MD 21205 USA
[4] Humboldt Univ, Div Res, Dept Urol, Univ Hosp Charite, Berlin, Germany
[5] Northwestern Univ, Feinberg Sch Med, Dept Urol, Chicago, IL 60611 USA
[6] Northwestern Univ, Feinberg Sch Med, Clin Prostate Canc Program, Robert H Lurie Comprehens Canc Ctr, Chicago, IL 60611 USA
[7] Univ Toronto, Princess Margaret Hosp, Div Urol, Univ Hlth Network, Toronto, ON, Canada