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There was heterogeneity in the reported RRs across studies, but our meta-analytic method fit the data and covered the estimated residuals (Extended Data Fig

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"As weve made clear, these product standards remain at the top of our priorities." The spokesperson said the agency, which handed the regulations off to the White House Office of Management and Budget (OMB) for final approval months ago, is limited from discussing the process further since the proposal remains pending

Therefore, variation in the quality of leachate is the most important difficulties and challenges in cigarette filter recycling, which will cause a shock in its treatment process