Reply to Stephen B. Williams, Donald L. Lamm, Ashish M. Kamat's Letter to the Editor re: Richard J. Sylvester, Willem Oosterlinck, Sten Holmang, et al. Systematic Review and Individual Patient Data Meta-analysis of Randomized Trials Comparing a Single Immediate Instillation of Chemotherapy After Transurethral Resection with Transurethral Resection Alone in Patients with Stage pTa-pT1 Urothelial Carcinoma of the Bladder: Which Patients Benefit from the Instillation? Eur Urol. In press. http://dx.doi.org/10.1016/j.eururo.2015.05.050.