Current strategies for monitoring men with localised prostate cancer lack a strong evidence base: observational longitudinal study.
Metcalfe C, Tilling K, Davis M, Lane JA, Martin RM, Kynaston H, Powell P, Neal DE, Hamdy F, Donovan JL, et al. Br J Cancer. 2009 Aug 4; 101(3):390-4. Epub 2009 Jul 14.