Our study was a prospective, multicenter study and was approved by the Institutional Review Board of Seoul National University Hospital (Seoul, South Korea) (approval number: H-1008-136-330) and Gachon University Gil Medical Center (Incheon, South Korea) (approval number: GAIRB2013-82). We prospectively collected data from consecutive patients who underwent HoLEP for management of symptomatic LUTS/BPH between 2010 and 2015. All operations were performed using a holmium: yttrium-aluminum-garnet laser by two surgeons (SJO and JKO). The holmium laser apparatus used in our study were OmniPulse (Trimedyne Inc., Irvine, CA, USA) and VersaPulse PowerSuite (Lumenis, Yokneam, Israel) [8 (link)].