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Objectives: To assess the variability between institutions in the recurrence rate at the first follow-up cystoscopy (RR-FFC) after transurethral resection (TUR) in patients with stage Ta T1 bladder cancer.Methods: A total of 2410 patients from seven EORTC phase III trials conducted between 1979 and 1989 were included. Patients with single and with multiple tumors were analyzed separately according...
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