A UK-based investigation of inter- and intra-observer reproducibility of Gleason grading of prostatic biopsies. - Melia, J.; Moseley, R.; Ball, R. Y.; Griffiths, D. F. R.; Grigor, K.; Harnden, P.; Jarmulowicz, M.; McWilliam, L. J.; Montironi, R; Waller, M.; Moss, S.; Parkinson, M. C. (Histopathology, 2006)