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Submitted on: 16 November 1998.
Revised on: 19 December 1998.
Accepted on: 13 January 1999.
___________________DIGESTIVE DISEASES AND SCIENCES
Submitted on: 05 August 2022.
Revised on: 12 November 2022.
Accepted on: 02 December 2022.
___________________DIGESTIVE DISEASES AND SCIENCES
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Submitted on: 07 June 1998.
Revised on: 26 September 1998.
Accepted on: 12 October 1998.
___________________DIGESTIVE DISEASES AND SCIENCES