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Ballam LD, Mendall MA, Asante, et al. J Clin Pathol 2000;53:314–17.
The authors would like to apologise for an error that occurred in this paper. It was stated throughout the paper that 665 children were tested but in fact the number was 669. In addition, in the first sentence of the results section of the abstract 530 of 691 (87%) should be 530 of 619 (86%). The authors stress that these errors do not change the message of the paper.