Incidence of positive pelvic lymph nodes in patients with prostate cancer, a prostate-specific antigen (PSA) level of < or = 10 ng / mL and biopsy Gleason score of < or = 6, and their influence on PSA progression-free survival after radical prostatectomy. - Weckermann,D.; Goppelt,M.; Dorn,R. (BJU Int, 2006)