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Flowchart of NPC patient inclusion and exclusion in the study cohort from the Chang Gung Memorial Hospital database. A total of 2666 patients diagnosed with NPC were recruited for this study. Aspirin users (≥180 days) were matched with non-users (None) based on a 1:4 propensity score (PSM), resulting in a final inclusion of 565 patients with NPC for data analysis.
