830 Clinical validation of a gene expression test for the non-invasive diagnosis of bladder cancer: A prospective, blinded, international and multicenter study von Ribal, M.J, Mengual, L, Lozano, J.J, Ingelmo-Torres, M, Palou, J, Rodriguez-Faba, O, Witjes, F, Van Der Heijden, A, Medina, R, Conde, J.M, Marberger, M, Schmidvauer, J, Fernandez, P.L, Alcaraz, A

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