Kim, Bup Wan, et al. “Effects of Previous or Synchronous Non-Muscle Invasive Bladder Cancer on Clinical Results After Radical Nephroureterectomy for Upper Tract Urothelial Carcinoma: A Multi-Institutional Study”. Urology Journal, vol. 12, no. 4, Sept. 2015, pp. 2233-9, doi:10.22037/uj.v12i4.2831.