Reply to Yuxuan Song, Caipeng Qin, and Tao Xu's Letter to the Editor re: J. Alberto Nakauma-González, Maud Rijnders, Job van Riet, et al. Comprehensive Molecular Characterization Reveals Genomic and Transcriptomic Subtypes of Metastatic Urothelial Carcinoma. Eur Urol 2022;81:331–6