Submitted on: 05 November 2000.
Revised on: 30 November 2000.
Accepted on: 30 December 2000.
___________________BMJ Case Reports---BMJ PUBLISHING GROUP
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Submitted on: 28 September 1998.
Revised on: 13 January 1999.
Accepted on: 16 February 1999.
___________________BMJ Case Reports---BMJ PUBLISHING GROUP
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