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Submitted on: 13 May 2004.
Revised on: 28 August 2004.
Accepted on: 05 October 2004.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
Submitted on: 28 October 1998.
Revised on: 26 December 1998.
Accepted on: 14 January 1999.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
Submitted on: 16 April 2004.
Revised on: 24 July 2004.
Accepted on: 19 September 2004.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
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Submitted on: 19 October 2000.
Revised on: 03 January 2001.
Accepted on: 14 February 2001.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG