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Submitted on: 12 July 1998.
Revised on: 05 November 1998.
Accepted on: 16 December 1998.
___________________ALIMENTARY PHARMACOLOGY & THERAPEUTICS
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Submitted on: 25 July 2011.
Revised on: 26 September 2011.
Accepted on: 23 October 2011.
___________________ALIMENTARY PHARMACOLOGY & THERAPEUTICS
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