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a, intravesical recurrence-free survival; b, intravesical recurrence-free survival in diagnostic subgroups A) voided urine cytology, B) retrograde/antegrade pyelography and/or selective urine cytology, C) ureteropyeloscopy with or without obtaining barbotage cytology, or D) ureteropyeloscopy with tumour biopsy; c, overall survival; d, cancer-specific survival.
