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Contour-enhanced funnel plot
(a) Paroxysmal atrial fibrillation frequency (Trim & Fill Method)
(b) Paroxysmal atrial fibrillation frequency (Outliers Removed + Trim & Fill Method)
(a) No studies added. (b) The "find.outliers" command in the RStudio "meta" package revealed four studies: "2017_Liu," "2013_shao," "2010_sheng," and "2012_men." The trim and fill method added '2019_zhang'.
