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[Correspondence] Head injury decision rules in children

In The Lancet (June 17, p 2393),1 Franz E Babl and colleagues report a prospective cohort study comparing the accuracy of three head injury decision rules in children: PECARN,2 CATCH,3 and CHALICE.4 As an author of the CATCH rules, I commend Babl and his team for their large prospective external validation study.