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Volume 71, no. 9, p. 5560-5571, 2002. Page 5569: The following section was inadvertently omitted from this article.
W. J. Snelling was supported by a CAST award from the Department of Higher and Further Education for Northern Ireland, with the kind support of the local poultry industry.
We thank Velma Hayes and Colm Lowery for their technical assistance and John Moore (Belfast City Hospital) for his sound technical advice.
