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Funnel plot of the (A) overall included studies (n = 9) using random effect model and (B) fixed effect model used for overall BNP mean difference measurement. Again, funnel plot of the (C) studies (n = 5) with GFR data using random effect model and (D) fixed effect model used to determine the mean difference of GFR. BNP = brain natriuretic peptide, GFR = glomerular filtration rate.
