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FGFR3 mutations and a normal CK20 staining pattern define low-grade noninvasive urothelial bladder tumors: van Oers JM, Wild PJ, Burger M, Denzinger S, Stoehr R, Rosskopf E, Hofstaedter F, Steyerberg EW, Klinkhammer-Schalke M, Zwarthoff EC, van der Kwast