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Study flow chart. From 1999 to 2008, this study enrolled a total of 10,617 patients with gastric cancer who received gastrectomy and adjuvant chemotherapy. Among the cohort, 1295 patients used PSK, and 5180 patients who did not use PSK were matched as the control group using 1:4 propensity score matching after adjusting for covariates including sex, age, urbanization comorbidities.
