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Submitted on: 23 January 2008.
Revised on: 06 March 2008.
Accepted on: 18 March 2008.
SAMJ SOUTH AFRICAN MEDICAL JOURNAL
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Submitted on: 18 November 2000.
Revised on: 09 December 2000.
Accepted on: 16 December 2000.
SAMJ SOUTH AFRICAN MEDICAL JOURNAL
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