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Submitted on: 14 April 1998.
Revised on: 05 August 1998.
Accepted on: 14 September 1998.
___________________Food Quality and Safety---OXFORD UNIV PRESS
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Submitted on: 19 August 2004.
Revised on: 09 September 2004.
Accepted on: 05 October 2004.
___________________Food Quality and Safety---OXFORD UNIV PRESS
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