Letter to the Editor RE: Mekayten et al., Will Stone Density Stop Being a Key Factor in Endourology? The Impact of Stone Density on Laser Time Using Lumenis Laser p120w and Standard 20w Laser: A Comparative Study (From: Mekayten M, Lorber A, Katafigiotis I, et al. J Endourol 2019;33:585–589; DOI: 10.1089/end.2019.0181)