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Submitted on: 27 June 2002.
Revised on: 02 August 2002.
Accepted on: 01 September 2002.
___________________JOURNAL OF CLINICAL PATHOLOGY---BMJ PUBLISHING GROUP
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Submitted on: 18 November 2000.
Revised on: 28 January 2001.
Accepted on: 10 February 2001.
___________________JOURNAL OF CLINICAL PATHOLOGY---BMJ PUBLISHING GROUP