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. 2022 Apr 25;22:205. doi: 10.1186/s12876-022-02277-y

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© The Author(s) 2022

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Fig. 2 — The Kaplan–Meier curve before and after PSM for OS and DFS. a OS before PSM; b DFS before PSM; c OS after PSM; d DFS after PSM. Note: PSM, propensity score matching; OS, overall survival; DFS, disease-free survival