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Submitted on: 31 January 2003.
Revised on: 28 February 2003.
Accepted on: 30 March 2003.
___________________BMJ Open Gastroenterology---BMJ PUBLISHING GROUP
Submitted on: 25 November 2021.
Revised on: 09 March 2022.
Accepted on: 29 March 2022.
___________________BMJ Open Gastroenterology---BMJ PUBLISHING GROUP
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