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. 2015 Mar 26;10(3):e0119469. doi: 10.1371/journal.pone.0119469

Fig 4. Funnel showing the incidence of blood staining on the devices: i-gel versus LMA-P.

Fig 4

White circles: comparisons included. Black circles: inputted comparisons using the trim-and-fill method. White diamond: pooled observed log risk ratio. Black diamond: pooled inputted log risk ratio.