Reply to Siebren Dijkstra and Carl J. Wijburg's Letter to the Editor re: Bernard H. Bochner, Guido Dalbagni, Karim H. Marzouk, et al. Randomized Trial Comparing Open Radical Cystectomy and Robot-assisted Laparoscopic Radical Cystectomy: Oncologic Outcomes. Eur Urol 2018;74:465-71. Can the Pattern of Cancer Recurrence Truly be Assigned to the Surgical Modality?