Comparison of prognostic prediction between nomogram based on lymph node ratio and AJCC 8th staging system for patients with resected pancreatic head carcinoma: a SEER analysis by Pu N, Li JA, Xu YL, Lee WL, Fang Y, Han X, Zhao GC, Zhang L, Nuerxiati A, Yin HL, Wu WC, Lou WH

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