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Correction

Correction

Figures & data

Figure 1. Flow chart for inclusion of children in the nested case control study: matching of controls to cases. Note: Cases are eligible to be controls up until their date of onset of persistent IA. Fifty-three cases had three matched controls, one case had two matched controls.

Figure 1. Flow chart for inclusion of children in the nested case control study: matching of controls to cases. Note: Cases are eligible to be controls up until their date of onset of persistent IA. Fifty-three cases had three matched controls, one case had two matched controls.