Kim, Ki Hong, et al. “The Association of A Number of Predictive Factors for The Recurrence of Papillary Urothelial Neoplasm of Low Malignant Potential: Prognostic Analysis From Multiple Academic Centers”. Urology Journal, vol. 16, no. 06, Dec. 2019, pp. 558-62, doi:10.22037/uj.v16i06.4519.