title: Bladder cancer: validity of the 2004 system for grading Ta bladder cancer.
authors.forename: Maximilian
authors.initials: M
authors.lastname: Burger
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Goebell
mesh_terms: D006801:Humans; D060787:Neoplasm Grading / Q000379:methods / Q000592:standards*; D015203:Reproducibility of Results; D001749:Urinary Bladder Neoplasms / Q000473:pathology* / Q000601:surgery*