Reassessing age limits: Outcomes of radical nephroureterectomy in octogenarian patients with upper tract urothelial carcinoma. - Song, Sang Hun; Lee, Haesung; Chung, Younsoo; Song, Byeongdo; Lee, Hakmin; Oh, Jong Jin; Lee, Sangchul; Byun, Seok-Soo; Hong, Sung Kyu (Investigative & Clinical Urology, 2026)