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. 2021 Jul 19;11(7):e048243. doi: 10.1136/bmjopen-2020-048243

Figure 1.

Figure 1

Data selection flow chart. ICD-O-3, Third Revision of the International Classification of Diseases for Oncology; SEER, Surveillance, Epidemiology, and End Results; UTUC, upper tract urothelial carcinoma; LNP, lymph nodes positive; LNE, lymph nodes examined.