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Submitted on: 08 August 2001.
Revised on: 02 December 2001.
Accepted on: 12 January 2002.
___________________GASTROENTEROLOGY CLINICS OF NORTH AMERICA
Submitted on: 16 September 2002.
Revised on: 28 October 2002.
Accepted on: 25 December 2002.
___________________GASTROENTEROLOGY CLINICS OF NORTH AMERICA
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Submitted on: 16 March 2009.
Revised on: 06 April 2009.
Accepted on: 25 April 2009.
___________________GASTROENTEROLOGY CLINICS OF NORTH AMERICA
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Submitted on: 22 November 2016.
Revised on: 05 March 2017.
Accepted on: 19 April 2017.
___________________GASTROENTEROLOGY CLINICS OF NORTH AMERICA
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