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    2_test

    {"project":"2_test","denotations":[{"id":"25146939-24467862-60562896","span":{"begin":161,"end":163},"obj":"24467862"}],"text":"Sample size\nWe estimated a total sample size of 2,100, assuming a headache prevalence ≥10% and an absolute margin of error of 1.3% with 95% confidence interval [13]."}