Reply to So-Ryoung Lee, Byoung-Won Park, and Jae Heon Kim's Letter to the Editor re: Christian Gratzke, Rob van Maanen, Christopher Chapple, et al. Long-term Safety and Efficacy of Combined Mirabegron and Solifenacin Compared with Monotherapy in Patients with Overactive Bladder: A Randomised, Multicentre Phase 3 Study (SYNERGY II). Eur Urol 2018;74:501-9.