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An authors’ error occurred in this paper by Dr Sundquist and others (2004;58:71–7).

Page 71, left column, second paragraph, line 8, a reference should be inserted

. Page 71, right column, first paragraph, line 8, exchange the existing reference (20) with reference

. Page 75, right column, last paragraph, lines 5 and 12, a reference should be inserted

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