Administration Intravesical Antineoplastic Agents/administration & dosage Combined Modality Therapy Cystectomy/methods Humans Randomized Controlled Trials as Topic Saline Solution/*administration & dosage/adverse effects Therapeutic Irrigation/adverse effects/methods Treatment Outcome Urethra Urinary Bladder Neoplasms/drug therapy/surgery/*therapy Continuous saline bladder irrigation Meta-analysis Non-muscle invasive bladder cancer Randomized controlled trials Transurethral resection of bladder tumors